add Steepfile

Steepfile

@@ -0,0 +1,20 @@
+target :app do
+  signature 'sig'
+
+  check 'app'
+
+  repo_path "gem_rbs/gems"
+
+  library 'pathname'
+  library 'logger'
+  library 'mutex_m'
+  library 'date'
+
+  library 'activesupport'
+  library 'actionpack'
+  library 'activejob'
+  library 'activemodel'
+  library 'actionview'
+  library 'activerecord'
+  library 'railties'
+end