Add typos spell checker to CI (#20)

# Objective

Prevent typos.

## Solution

Add the `typos` spell checker to CI.

.github/workflows/ci.yml

@@ -55,4 +55,20 @@ jobs:
       - name: Run cargo clippy
         # TODO: Mark warnings as errors once all warnings are gone 
         # run: cargo clippy -- -D warnings
-        run: cargo clippy
+        run: cargo clippy
+
+  typos:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check for typos
+        uses: crate-ci/[email protected]
+      - name: Typos info
+        if: failure()
+        run: |
+          echo 'To fix typos, please run `typos -w`'
+          echo 'To check for a diff, run `typos`'
+          echo 'You can find typos here: https://crates.io/crates/typos'
+          echo 'if you use VSCode, you can also install `Typos Spell Checker'
+          echo 'You can find the extension here: https://marketplace.visualstudio.com/items?itemName=tekumara.typos-vscode'