Docs for plugin package

ReadMe.md

@@ -16,6 +16,7 @@ These scripts support **UE4 and UE5** and will detect which one your project is
 * [Getting Latest for Artists](./doc/GetLatest.md): pulls from git and builds so C++ changes are automatically updated
 * [Synchronising BuiltData Files outside of Git](./doc/DataSync.md)
 * [Cleaning Up](./doc/Cleanup.md): Deleting unneeded Hot Reload DLLs etc
+* [Packaging a Marketplace Plugin](./doc/PluginPackage.md)
 
 
 ## Prerequisites

doc/PluginPackage.md

@@ -0,0 +1,36 @@
+# Packaging a Plugin for the Marketplace
+
+To distribute a plugin on the marketplace, you need to zip it up and make sure
+you only include approved files. The `ue-plugin-package.ps1` script is here
+to make that job easier.
+
+> Note: unless you use the `-keepversion`, the script will update your .uplugin
+> file to record the new version number and potentially set Installed=true.
+> Unfortunately the first time, this will probably mess with indents.
+
+```sh
+Usage:
+  ue-plugin-package.ps1 [-src:sourcefolder] [-major|-minor|-patch|-hotfix] [options...]
+
+  -src          : Source folder (current folder if omitted), must contain pluginconfig.json
+  -major        : Increment major version i.e. [x++].0.0.0
+  -minor        : Increment minor version i.e. x.[x++].0.0
+  -patch        : Increment patch version i.e. x.x.[x++].0 (default)
+  -hotfix       : Increment hotfix version i.e. x.x.x.[x++]
+  -keepversion  : Keep current version number, doesn't tag unless -forcetag
+  -forcetag     : Move any existing version tag
+  -notag        : Don't tag even if updating version
+  -test         : Testing mode, separate builds, allow dirty working copy
+  -browse       : After packaging, browse the output folder
+  -dryrun       : Don't perform any actual actions, just report on what you would do
+  -help         : Print this help
+```
+
+This script operates based on a `pluginconfig.json` file which must be present
+in the root of your plugin, next to the .uplugin file. The options are:
+
+```json
+{
+    "OutputDir": "C:\\Users\\Steve\\MarketplaceBuilds",
+    "PluginFile": "OptionalPluginFilenameWillDetectInDirOtherwise.uplugin"
+}