Default readme for assets directory

v2/pkg/commands/build/internal/assets/README.md

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+# Assets Directory
+
+The assets directory is used to house all the assets of your application. 
+
+The structure is:
+
+  * dialog - Icons for dialogs
+  * tray - Icons for the system tray
+  * custom - A place for assets you wish to bundle in the application
+  * mac - MacOS specific files
+  * linux - Linux specific files
+  * windows - Windows specific files
+
+## Dialog Icons
+
+Place any PNG file in this directory to be able to use them in message dialogs.
+The files should have names in the following format: `name[-(light|dark)][2x].png`
+
+Examples:
+
+* `mypic.png` - Standard definition icon with ID `mypic` 
+* `mypic-light.png` - Standard definition icon with ID `mypic`, used when system theme is light  
+* `mypic-dark.png` - Standard definition icon with ID `mypic`, used when system theme is dark
+* `mypic2x.png` - High definition icon with ID `mypic`
+* `mypic-light2x.png` - High definition icon with ID `mypic`, used when system theme is light
+* `mypic-dark2x.png` - High definition icon with ID `mypic`, used when system theme is dark
+
+### Order of preference
+
+Icons are selected with the following order of preference:
+
+For High Definition displays:
+* name-(theme)2x.png
+* name2x.png
+* name-(theme).png
+* name.png
+  
+For Standard Definition displays:
+* name-(theme).png
+* name.png
+
+## Tray
+
+Place any PNG file in this directory to be able to use them as tray icons.
+The name of the filename will be the ID to reference the image.
+
+Example:
+
+* `mypic.png` - May be referenced using `runtime.Tray.SetIcon("mypic")` 
+
+## Custom
+
+Any file in this directory will be embedded into the app using the Wails asset bundler.
+Assets can be retrieved using the following methods:
+
+* `wails.Assets().Read(filename string) ([]byte, error)`  
+* `wails.Assets().String(filename string) (string, error)`
+
+The filename should include the path to the file relative to the `custom` directory.
+
+## Mac
+
+The `mac` directory holds files specific to Mac builds, such as `info.plist`. These may be edited and used as part of the build.