chore: ignore metadata.json files

Author: tgpetrov

.gitignore

@@ -4,6 +4,7 @@ node_modules/
 *.js
 *.js.map
 *.esm.json
+*.metadata.json
 *.log
 demo/**/*.js
 !demo/karma.conf.js
@@ -17,4 +18,4 @@ demo-angular/platforms/
 !demo/e2e-tests/*
 /src/platforms/android/nativescript_facebook.aar
 /src/*.tgz
-/publish/package/*.tgz
+/publish/package/*.tgz