Add getting started

Author: jorgectf

README.md

@@ -1,3 +1,33 @@
 # Community Packs
 
 Collection of community-driven CodeQL query and extension packs
+
+## Getting started
+
+### CodeQL packs syntax
+
+Using `githubsecuritylab/codeql-LANG-queries` will reference the default suite for that pack (e.g. `python.qls` for python). However, you may use a different suite such as `python-audit.qls` by using the following syntax: `githubsecuritylab/codeql-python-queries:suites/python-audit.qls`. The examples below work for both situations.
+
+### CodeQL Action
+
+```yaml
+- name: Initialize CodeQL
+  uses: github/codeql-action/init@v2
+  with:
+    languages: ${{ matrix.language }}
+    packs: githubsecuritylab/codeql-${{ matrix.language }}-queries
+```
+
+#### Via configuration file
+
+```bash
+$ cat codeql-config.yml | grep -A 1 'packs:'
+packs:
+  - githubsecuritylab/codeql-python-queries
+```
+
+### CodeQL CLI
+
+```bash
+codeql database analyze db/ --download githubsecuritylab/codeql-python-queries --format=sarif-latest --output=results.sarif
+```