Create cheapgm.yaml (#871)

Add CheapGM

Author: ZNSCTO

data/projects/c/cheapgm.yaml

@@ -0,0 +1,14 @@
+version: 7
+name: cheapgm
+display_name: CheapGM
+description: CheapGM is a gamified on-chain greeting platform that makes saying “GM” more fun and rewarding.
+Every GM is recorded on-chain, earns you XP, and builds your streak.
+websites:
+  - url: https://www.gm.cheap/
+social:
+  twitter:
+    - url: https://x.com/gmcheap
+github:
+  - url: https://github.com/CheapGM
+defillama:
+  - url: https://defillama.com/protocol/cheapgm