plugin compilation md

Cmd/compile_plugin.md

@@ -0,0 +1,12 @@
+
+
+```sh
+./RunUAT.sh BuildPlugin -Plugin="/path/to/MyPlugin.uplugin" -Package="/path/to/build_dir"  -TargetPlatforms=Linux
+```
+
+/!\ the directory `build_dir` will be erased
+
+Enable the plugin by default by adding to the .uplugin
+```json
+"EnabledByDefault": true,
+```