Update funding information in FUNDING.yml

Updated GitHub Sponsors username and commented out other funding options.

.github/FUNDING.yml

@@ -0,0 +1,15 @@
+# These are supported funding model platforms
+
+github: agessaman # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+# patreon: # Replace with a single Patreon username
+#open_collective: # Replace with a single Open Collective username
+#ko_fi: # Replace with a single Ko-fi username
+#tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+#community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+#liberapay: # Replace with a single Liberapay username
+#issuehunt: # Replace with a single IssueHunt username
+#lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
+#polar: # Replace with a single Polar username
+#buy_me_a_coffee: # Replace with a single Buy Me a Coffee username
+#thanks_dev: # Replace with a single thanks.dev username
+#custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']