add FUNDING file

Author: endel

.github/FUNDING.yml

@@ -0,0 +1,8 @@
+# These are supported funding model platforms
+
+github: endel # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: endel # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: endeld # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+custom: https://www.paypal.me/endeld # Replace with a single custom sponsorship URL