chore: Add .gitignore file to manage ignored files

Author: wudidapaopao

.gitignore

@@ -0,0 +1,20 @@
+*.so
+*.bundle
+*.swp
+*.log
+*.o
+
+Gemfile.lock
+.rspec_statu
+.ruby-version
+.vscode
+
+doc/
+gems/
+issues/
+pkg/
+ports/
+tmp/
+vendor/
+test/
+testdb/