add repository funding file

Author: tiagoschenkel

.github/FUNDING.yml

@@ -0,0 +1 @@
+tidelift: "npm/@robotlegsjs/phaser-ce-signalcommandmap"

CHANGELOG.md

@@ -41,6 +41,10 @@ Types of changes:
 - in case of vulnerabilities.
 -->
 
+#### Added
+
+- Add **Tidelift** as funding option (see #47).
+
 #### Security
 
 - Migrate to [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) to solve security vulnerability (see #46).