Dependency Update, Added examples/basic, CI

Updated the dependencies to the newest version.
Added `AsRef` and `Deref` traits to the extractors.
Moved the example from `README.md` to `examples/basic`.
Added a CI Pipeline.

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: Cargo Build & Test
+
+on:
+  push:
+  pull_request:
+  schedule:
+  - cron: '0 0 1,7,14,21 * *'
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build_and_test:
+    name: axum-oidc - latest
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        toolchain:
+        - stable
+        - nightly
+    steps:
+    - uses: actions/checkout@v3
+    - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
+    - run: cargo build --verbose
+    - run: cargo test --verbose
+
+  build_examples:
+    name: axum-oidc - examples
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - run: rustup update stable && rustup default stable
+    - run: cargo build --verbose
+      working-directory: ./examples/basic