Add .gitignore (#28)

Reviewed-on: https://codeberg.org/woodpecker-plugins/go-plugin/pulls/28

.gitignore

@@ -0,0 +1,23 @@
+
+### Go ###
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+vendor/
+
+# Go workspace file
+go.work
+
+### IDE ###
+.vscode/