add quality control CI Action

- add prettier for yaml and md files
- add `cargo-audit` job
- add `cargo-clippy` job
- fix missing references in readme.md

This includes a reformat of both `readme.md` files

.github/workflows/qc.yaml

@@ -0,0 +1,47 @@
+name: Quality Control
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  checks: write
+  contents: read
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actionsx/prettier@v2
+        with:
+          args: --check .
+
+  cargo-clippy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - run: rustup component add clippy
+      - name: Install xmllint
+        run: sudo apt-get install -y libsodium-dev
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
+
+  cargo-audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}