[Improvement] Move to create-react-app (#17, #15)

.gitignore

@@ -1,7 +1,25 @@
-node_modules/
-public/bundle*.js
-config/
+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
 .vscode/
 src/data/awsClient
-src/components/AWS.tsx
-npm-debug.log
+src/components/AWS.tsx