Added certs to gitignore

.gitignore

@@ -1,2 +1,33 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+react-frontend/node_modules
+expressjs-backend/node_modules
+react-frontend/reactcert/cert.pem
+react-frontend/reactcert/key.pem
+expressjs-backend/cert.pem
+expressjs-backend/key.pem
+.env
 node_modules
-.env
+
+# 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*
+
+