Add security policy and code analysis job

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,40 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    - cron: '44 16 * * 2'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'cpp', '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 }}
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

SECURITY.rst

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+Security Policy
+===============
+
+Supported Versions
+------------------
+
+Only recent development version are currently being supported with security updates.
+
++---------+--------------------+
+| Version | Supported          |
++=========+====================+
+| 0.5.x   | Development        |
++---------+--------------------+
+| < 0.5   | not supported      |
++---------+--------------------+
+
+Reporting a Vulnerability
+-------------------------
+
+Please disclose security vulnerabilities privately at miurahr@linux.com