Added checklist to PR template (#5774)

.github/ISSUE_TEMPLATE.md

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+Per Mattermost guidelines, GitHub issues are for bug reports: <http://www.mattermost.org/filing-issues/>.
+
+For troubleshooting see: http://forum.mattermost.org/.
+For feature proposals see: http://www.mattermost.org/feature-requests/
+
+If you've found a bug--something appears unintentional--please follow these steps:
+
+1. Confirm you’re filing a new issue. [Search existing tickets in Jira](https://mattermost.atlassian.net/jira/software/c/projects/MM/issues/) to ensure that the ticket does not already exist.
+2. Confirm your issue does not involve security. Otherwise, please see our [Responsible Disclosure Policy](https://about.mattermost.com/report-security-issue/).
+3. [File a new issue](https://github.com/mattermost/mattermost-mobile/issues/new) using the format below. Mattermost will confirm steps to reproduce and file in Jira, or ask for more details if there is trouble reproducing it. If there's already an existing bug in Jira, it will be linked back to the GitHub issue so you can track when it gets fixed.
+
+#### Summary
+Bug report in one concise sentence
+
+### Environment Information
+  - Device Name:
+  - OS Version:
+  - Mattermost App Version:
+  - Mattermost Server Version:
+
+#### Steps to reproduce
+How can we reproduce the issue (what version are you using?)
+
+#### Expected behavior
+Describe your issue in detail
+
+#### Observed behavior (that appears unintentional)
+What did you see happen? Please include relevant error messages, screenshots and/or video recordings.
+
+#### Possible fixes
+If you can, link to the line of code that might be responsible for the problem
+

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thank you for contributing a pull request! Here are a few tips to help you:
+
+1. If this is your first contribution, make sure you've read the Contribution Checklist https://developers.mattermost.com/contribute/getting-started/contribution-checklist/
+2. Read our blog post about "Submitting Great PRs" https://developers.mattermost.com/blog/2019-01-24-submitting-great-prs
+3. Take a look at other repository specific documentation at https://developers.mattermost.com/contribute
+-->
+
+#### Summary
+<!--
+A brief description of what this pull request does.
+-->
+
+#### Ticket Link
+<!--
+If this pull request addresses a Help Wanted ticket or fixes a reported issue, please link the relevant GitHub issue, e.g.
+
+  Fixes https://github.com/mattermost/mattermost-mobile/issues/XXXXX
+
+Otherwise, link the JIRA ticket.
+-->
+
+#### Checklist
+<!--
+Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.
+-->
+- [ ] Added or updated unit tests (required for all new features)
+- [ ] Has UI changes
+- [ ] Includes text changes and localization file updates
+- [ ] Have tested against the 5 core themes to ensure consistency between them.
+
+#### Device Information
+This PR was tested on: <!-- Device name(s), OS version(s) -->
+
+#### Screenshots
+<!--
+If the PR includes UI changes, include screenshots/GIFs/Videos (for both iOS and Android if possible).
+-->
+
+#### Release Note
+<!--
+Add a release note for each of the following conditions:
+
+* New features and improvements, including behavioural changes, UI changes
+* Bug fixes and fixes of previous known issues
+* Deprecation warnings, breaking changes, or compatibility notes
+
+If no release notes are required write NONE. Use past-tense. Newlines are stripped.
+
+Example:
+
+```release-note
+Added a new config setting ServiceSettings.FooBar. Added a new column Foo to the Users table.
+```
+
+```release-note
+NONE
+```
+-->
+
+```release-note
+
+```

.github/workflows/codeql-analysis.yml

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+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1