[CI] Adds formatter to CI (#6272)

* Adds formatters CI

Adds Error message & setup formatting like cpp

Adds Swift

Adds typescript

Adds python

tests yarn

Adds format.md

* Removes unneeded scripts + moves install script to install phase

* Adds format.md content

* Adds cpp to the formatter.md and fixes ci

* Adds cpp to formatter ci

.travis/format_check.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+#
+# Copyright 2020 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+# HACKY solution to make nodejs work.
+source ~/.nvm/nvm.sh
+nvm alias default node
+nvm use default
+
+sh src/clang-format-git.sh
+
+node_modules/.bin/eslint ts/** --ext .ts --quiet --fix
+
+#PYTHON IS DISABLED UNTIL WE CREATE A .pylintrc FILE FOR IT
+pylint python/** --disable=all
+
+swiftformat --config swift.swiftformat .
+
+if ! git diff --quiet; then
+  echo >&2
+  echo "ERROR: ********************************************************" >&2
+  echo "ERROR: The following differences were found after running" >&2
+  echo "ERROR: .travis/format_check.sh script. Maybe you forgot to format" >&2
+  echo "ERROR: the code after making changes? please check Formatters.md" >&2
+  echo "ERROR: ********************************************************" >&2
+  echo >&2
+  git diff --binary --exit-code
+fi