update readme.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -1,6 +1,6 @@
 # drone-scp
 
-[![GoDoc](https://godoc.org/github.com/appleboy/drone-scp?status.svg)](https://godoc.org/github.com/appleboy/drone-scp) [![Build Status](http://drone.wu-boy.com/api/badges/appleboy/drone-scp/status.svg)](http://drone.wu-boy.com/appleboy/drone-scp) [![codecov](https://codecov.io/gh/appleboy/drone-scp/branch/master/graph/badge.svg)](https://codecov.io/gh/appleboy/drone-scp) [![Go Report Card](https://goreportcard.com/badge/github.com/appleboy/drone-scp)](https://goreportcard.com/report/github.com/appleboy/drone-scp) [![Docker Pulls](https://img.shields.io/docker/pulls/appleboy/drone-scp.svg)](https://hub.docker.com/r/appleboy/drone-scp/)
+[![GoDoc](https://godoc.org/github.com/appleboy/drone-scp?status.svg)](https://godoc.org/github.com/appleboy/drone-scp) [![Build Status](http://drone.wu-boy.com/api/badges/appleboy/drone-scp/status.svg)](http://drone.wu-boy.com/appleboy/drone-scp) [![codecov](https://codecov.io/gh/appleboy/drone-scp/branch/master/graph/badge.svg)](https://codecov.io/gh/appleboy/drone-scp) [![Go Report Card](https://goreportcard.com/badge/github.com/appleboy/drone-scp)](https://goreportcard.com/report/github.com/appleboy/drone-scp) [![Docker Pulls](https://img.shields.io/docker/pulls/appleboy/drone-scp.svg)](https://hub.docker.com/r/appleboy/drone-scp/) [![](https://images.microbadger.com/badges/image/appleboy/drone-scp.svg)](https://microbadger.com/images/appleboy/drone-scp "Get your own image badge on microbadger.com")
 
 [Drone](https://github.com/drone/drone) plugin to copy files and artifacts via SSH. 
 
@@ -11,22 +11,26 @@
 * [x] Support send files to multiple target folder on host.
 * [x] Support load ssh key from absolute path or raw body.
 
-## Build
+## Build or Download a binary
 
-Build the binary with the following commands:
+The pre-compiled binaries can be downloaded from [release page](https://github.com/appleboy/drone-scp/releases). Support the following OS type.
+
+* Windows amd64/386
+* Linux amd64/386
+* Darwin amd64/386
+
+With `Go` installed
+
+```
+$ go get -u -v github.com/appleboy/drone-scp
+``` 
+
+or build the binary with the following command:
 
 ```
 $ make build
 ```
 
-## Testing
-
-Test the package with the following command:
-
-```
-$ make test
-```
-
 ## Docker
 
 Build the docker image with the following commands:
@@ -36,7 +40,7 @@ $ make docker
 ```
 
 Please note incorrectly building the image for the correct x64 linux and with
-GCO disabled will result in an error when running the Docker image:
+CGO disabled will result in an error when running the Docker image:
 
 ```
 docker: Error response from daemon: Container command
@@ -45,11 +49,159 @@ docker: Error response from daemon: Container command
 
 ## Usage
 
+There are three ways to send notification.
+
+* [usage from binary](#usage-from-binary)
+* [usage from docker](#usage-from-docker)
+* [usage from drone ci](#usage-from-drone-ci)
+
+<a name="usage-from-binary"></a>
+### Usage from binary
+
+#### Using public key
+
+```bash
+drone-scp --host=example.com \
+  --port=22 \
+  --username=appleboy \
+  --key-path="${HOME}/.ssh/id_rsa" \
+  --target=/home/appleboy/test \
+  --source=your_local_folder_path
+```
+
+#### Using password
+
+```diff
+drone-scp --host=example.com \
+  --port=22 \
+  --username=appleboy \
++  --password=xxxxxxx \
+  --target=/home/appleboy/test \
+  --source=your_local_folder_path
+```
+
+#### Using ssh-agent
+
+Start your local ssh agent:
+
+```bash
+eval `ssh-agent -s`
+```
+
+Import your local public key `~/.ssh/id_rsa`
+
+```bash
+$ ssh-add
+```
+
+You don't need to add `--password` or `--key-path` arguments.
+
+```bash
+drone-scp --host=example.com \
+  --port=22 \
+  --username=appleboy \
+  --target=/home/appleboy/test \
+  --source=your_local_folder_path
+```
+
+#### Send multiple source or target folder and hosts
+
+```diff
+drone-scp --host=example1.com \
++  --host=example2.com \
+  --port=22 \
+  --username=appleboy \
+  --password= xxxxxxx
+  --target=/home/appleboy/test1 \
++  --target=/home/appleboy/test2 \
+  --source=your_local_folder_path_1
++  --source=your_local_folder_path_2
+```
+
+<a name="usage-from-docker"></a>
+### Usage from docker
+
+#### Using public key
+
+```bash
+docker run --rm \
+  -e SCP_HOST=example.com \
+  -e SCP_USERNAME=xxxxxxx \
+  -e SCP_PORT=22 \
+  -e SCP_KEY_PATH="${HOME}/.ssh/id_rsa"
+  -e SCP_SOURCE=SOURCE_FILE_LIST \
+  -e SCP_TARGET=TARGET_FOLDER_PATH \
+  -v $(pwd):$(pwd) \
+  -w $(pwd) \
+  appleboy/drone-scp
+```
+
+#### Using password
+
+```diff
+docker run --rm \
+  -e SCP_HOST=example.com \
+  -e SCP_USERNAME=xxxxxxx \
+  -e SCP_PORT=22 \
++  -e SCP_PASSWORD="xxxxxxx"
+  -e SCP_SOURCE=SOURCE_FILE_LIST \
+  -e SCP_TARGET=TARGET_FOLDER_PATH \
+  -v $(pwd):$(pwd) \
+  -w $(pwd) \
+  appleboy/drone-scp
+```
+
+#### Using ssh-agent
+
+Start your local ssh agent:
+
+```bash
+eval `ssh-agent -s`
+```
+
+Import your local public key `~/.ssh/id_rsa`
+
+```bash
+$ ssh-add
+```
+
+You don't need to add `SCP_PASSWORD` or `SCP_KEY_PATH ` arguments.
+
+```bash
+docker run --rm \
+  -e SCP_HOST=example.com \
+  -e SCP_USERNAME=xxxxxxx \
+  -e SCP_PORT=22 \
+  -e SCP_SOURCE=SOURCE_FILE_LIST \
+  -e SCP_TARGET=TARGET_FOLDER_PATH \
+  -v $(pwd):$(pwd) \
+  -w $(pwd) \
+  appleboy/drone-scp
+```
+
+#### Send multiple source or target folder and hosts
+
+```bash
+docker run --rm \
+  -e SCP_HOST=example1.com,example2.com \
+  -e SCP_USERNAME=xxxxxxx \
+  -e SCP_PASSWORD=xxxxxxx \
+  -e SCP_PORT=22 \
+  -e SCP_SOURCE=SOURCE_FILE_LIST_1,SOURCE_FILE_LIST_2 \
+  -e SCP_TARGET=TARGET_FOLDER_PATH_1,TARGET_FOLDER_PATH_2 \
+  -v $(pwd):$(pwd) \
+  -w $(pwd) \
+  appleboy/drone-scp
+```
+
+<a name="usage-from-drone-ci"></a>
+### Usage from drone ci
+
 Execute from the working directory:
 
 ```bash
 docker run --rm \
-  -e PLUGIN_HOST=http://example.com \
+  -e PLUGIN_HOST=example.com \
   -e PLUGIN_USERNAME=xxxxxxx \
   -e PLUGIN_PASSWORD=xxxxxxx \
   -e PLUGIN_PORT=xxxxxxx \
@@ -71,13 +223,10 @@ docker run --rm \
   appleboy/drone-scp
 ```
 
-Load all environments from file.
+## Testing
+
+Test the package with the following command:
 
-```bash
-docker run --rm \
-  -e ENV_FILE=your_env_file_path \
-  -e PLUGIN_KEY="$(cat ${HOME}/.ssh/id_rsa)" \
-  -v $(pwd):$(pwd) \
-  -w $(pwd) \
-  appleboy/drone-scp
 ```
+$ make test
+```