Create Options.md

Add documentation for `app.command.Options`

Author: JRiggles

api/command/Options.md

@@ -0,0 +1,22 @@
+# Options
+
+```lua
+app.command.Options()
+```
+
+Opens the Aseprite preferences dialog.
+
+
+This command can also be used to prompt the user to install an Aseprite extension file.
+
+## Example
+
+```lua
+app.command.Options {
+  installExtension="" 
+}
+```
+
+Parameters:
+
+* `installExtension`: the path to the `*.aseprite-extension` file to be installed