Add codespell CI and document Homebrew path in Shortcut setup

Credits:
- codespell config and workflow adapted from #37 by @yarikoptic
- Homebrew path documentation from #34 by @benwinding

Author: schappim

.codespellrc

@@ -0,0 +1,5 @@
+[codespell]
+# Ref: https://github.com/codespell-project/codespell#using-a-config-file
+skip = .git*,*.lock,.codespellrc,Pods
+check-hidden = true
+ignore-words-list = inout

.github/workflows/codespell.yml

@@ -0,0 +1,25 @@
+# Codespell configuration is within .codespellrc
+---
+name: Codespell
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Annotate locations with typos
+        uses: codespell-project/codespell-problem-matcher@v1
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2

README.md

@@ -130,7 +130,9 @@ Run `ocr --list-languages` to see all available languages on your system.
 1. Open up [MacOS Shortcuts](https://www.icloud.com/shortcuts/fa91687e481849d6a27ff873ec71599b) available on MacOS 12+.
 2. Create new `Shortcut`
 3. Add `Run Shell script`
-4. Set input as `/usr/local/bin/ocr` (runs this app)
+4. Set input to one of these (runs this app):
+  - `/opt/homebrew/bin/ocr` (if installed via Homebrew on Apple Silicon)
+  - `/usr/local/bin/ocr` (if installed manually or via Homebrew on Intel)
 5. Goto `Shortcut Details`
 
 <img width="300px" src="https://user-images.githubusercontent.com/11782590/164676495-3c07a73f-5254-47eb-a4ff-d6a943617954.png" alt="settings" />