Add documentation
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+This plugin exposes Gerrit metrics to Prometheus.
+
+The metrics can be accessed at the @URL@plugins/@PLUGIN@/metrics URL.
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+Build
+=====
+
+With Bazel
+----------
+
+This plugin can be built with Bazel.
+
+Clone (or link) this plugin to the `plugins` directory of Gerrit's source tree.
+Put the external dependency Bazel build file into the Gerrit /plugins directory,
+replacing the existing empty one.
+
+```
+ cd gerrit/plugins
+ rm external_plugin_deps.bzl
+ ln -s @PLUGIN@/external_plugin_deps.bzl .
+```
+
+Then issue
+
+```
+ bazel build plugins/@PLUGIN@
+```
+
+in the root of Gerrit's source tree to build
+The output is created in
+
+```
+ bazel-genfiles/plugins/@PLUGIN@/@PLUGIN@.jar
+```
+
+This project can be imported into the Eclipse IDE.
+Add the plugin name to the `CUSTOM_PLUGINS` set in
+Gerrit core in `tools/bzl/plugins.bzl`, and execute:
+
+```
+ ./tools/eclipse/project.py
+```
+
+With Maven
+----------
+
+To build with Maven, change directory to the plugin folder and issue the command:
+
+```
+ mvn clean package
+```
+When building with Maven, the Gerrit Plugin API must be available.
+
+[Back to @PLUGIN@ documentation index][index]
+
+[index]: index.html
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