Add MIT license

Author: bpapillon

.fernignore

@@ -1,5 +1,6 @@
 # Specify files that shouldn't be modified by Fern
 
+LICENSE
 README.md
 
 # Inherits from base_client.py
@@ -16,4 +17,4 @@ src/schematic/webhook_utils/
 src/schematic/webhooks/verification.py
 tests/custom/
 tests/webhook_utils/
-CLAUDE.md
+CLAUDE.md