Add CLA workflow (#156)

* add workflow

* style fix

* point cla action to code42-cla repo

* Add CLA note to contributing guide

Author: timabrmsn

.github/workflows/cla.yml

@@ -0,0 +1,33 @@
+name: "CLA Assistant"
+on:
+  issue_comment:
+    types: [created]
+  pull_request_target:
+    types: [opened,closed,synchronize]
+
+jobs:
+  CLAssistant:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "CLA Assistant"
+        if: (github.event.comment.body == 'recheckcla' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
+        # Alpha Release
+        uses: cla-assistant/github-action@v2.0.1-alpha
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # the below token should have repo scope and must be manually added by you in the repository's secret
+          PERSONAL_ACCESS_TOKEN : ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+        with:
+          path-to-signatures: '.cla_signatures.json'
+          path-to-cla-document: 'https://code42.github.io/code42-cla/Code42_Individual_Contributor_License_Agreement'
+          # branch should not be protected
+          branch: 'master'
+          allowlist: alang13,unparalleled-js,kiran-chaudhary,timabrmsn,ceciliastevens,DiscoRiver,annie-payseur,amoravec,patelsagar192
+
+          #below are the optional inputs - If the optional inputs are not given, then default values will be taken
+          #remote-organization-name: enter the remote organization name where the signatures should be stored (Default is storing the signatures in the same repository)
+          remote-repository-name: code42-cla
+          #create-file-commit-message: 'For example: Creating file for storing CLA Signatures'
+          #signed-commit-message: 'For example: $contributorName has signed the CLA in #$pullRequestNo'
+          #custom-notsigned-prcomment: 'pull request comment with Introductory message to ask new contributors to sign'
+          #custom-allsigned-prcomment: 'pull request comment when all contributors has signed, defaults to **CLA Assistant Lite bot** All Contributors have signed the CLA.'

CONTRIBUTING.md

@@ -188,4 +188,8 @@ Document all notable consumer-affecting changes in CHANGELOG.md per principles a
 
 When you're satisfied with your changes, open a PR and fill out the pull request template file. We recommend prefixing the name of your branch and/or PR title with `bugfix`, `chore`, or `feature` to help quickly categorize your change. Your unit tests and other checks will run against all supported python versions when you do this.
 
+For contributions from non-Code42 employees, we require you to agree to our [Contributor License Agreement](https://code42.github.io/code42-cla/Code42_Individual_Contributor_License_Agreement).
+
+On submission of your first PR, a GitHub action will run requiring you to reply in a comment with your affirmation of the CLA before the PR will be able to be merged.
+
 A team member should get in contact with you shortly to help merge your PR to completion and get it ready for a release!