add gitignore

.gitignore

@@ -0,0 +1,21 @@
+# See https://help.github.com/articles/ignoring-files for more about ignoring files.
+#
+# If you find yourself ignoring temporary files generated by your text editor
+# or operating system, you probably want to add a global ignore instead:
+#   git config --global core.excludesfile '~/.gitignore_global'
+
+# Ignore bundler config.
+.bundle
+
+# Ignore all logfiles and tempfiles.
+/log/*.log
+/tmp
+
+# Ignore any ruby version directives
+.ruby-*
+
+# ignore any env secrets files
+.env
+
+# ignore the annoying mac finder metadata file
+.DS_Store