More additions to be in sync with other plugins (#21)

* Use specific plugin versions, pull latest versions and enable a microbadger webhook

* Use the new plugins/base:multiarch image

* Write readme like it is done for other plugins

* Downcase all wording like on other plugins, move variables to correct file

* Added dockerignore file

* Added missing schema version label

* Only execute webhook on master branch

* Added issue and pull request templates

* Added blank line to gitignore

.github/issue_template.md

@@ -0,0 +1,9 @@
+<!-- PLEASE READ BEFORE DELETING
+
+Bugs or Issues? Due to the high number of false positive issues we receive,
+please do not create a GitHub issue until you have discussed and verified
+with community support at:
+
+    https://gitter.im/drone/drone
+
+-->

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+<!-- PLEASE READ BEFORE DELETING
+
+Please discuss changes before creating pull requests.
+
+    https://gitter.im/drone/drone
+
+-->