Add README.md

Change-Id: I00c4cb4dd3ef3ef1e6c0eb5727305fbafc6a7d7b

README.md

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+# Gerrit Code Review Automerger Plugin
+
+See src/main/resources/documentation.
+
+## Web Plugin Development
+
+For running unit tests execute:
+
+    bazel test --test_output=all //plugins/automerger/web:karma_test
+
+For checking or fixing eslint formatter problems run:
+
+    bazel test //plugins/automerger/web:lint_test
+    bazel run //plugins/automerger/web:lint_bin -- --fix "$(pwd)/plugins/automerger/web"
+
+For testing the plugin with
+[Gerrit FE Dev Helper](https://gerrit.googlesource.com/gerrit-fe-dev-helper/)
+build the JavaScript bundle and copy it to the `plugins/` folder:
+
+    bazel build //plugins/automerger/web:automerger
+    cp -f bazel-bin/plugins/automerger/web/automerger.js plugins/
+
+and let the Dev Helper redirect from `.+/plugins/automerger/static/automerger.js` to
+`http://localhost:8081/plugins_/automerger.js`.
+