adding docs generation

.github/workflows/build.yml

@@ -31,4 +31,26 @@ jobs:
       - name: Cargo Test
         uses: actions-rs/cargo@v1
         with:
-          command: test
+          command: test
+
+  doc:
+    runs-on: ubuntu-latest
+    needs: [ build ] # for ignoring bad builds
+    if: github.event_name == 'push' && github.ref == 'refs/heads/master'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Build Docs
+        run: cargo doc --no-deps --document-private-items
+
+      - name: Deploy To Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./target/doc