[orx-git-archiver-gradle] Add Gradle plugin for GitArchiver

orx-jvm/orx-git-archiver-gradle/README.md

@@ -0,0 +1,9 @@
+# orx-git-archive-gradle
+
+A Gradle plugin that turns a git history and `screenshots` directory into a markdown file.
+
+## Usage
+
+`openrndr-template` uses this plugin by default. All you need to do is use [orx-git-archiver](../orx-git-archiver) such
+that screenshots will have the Git commit id in their filename.
+