Github: Create codespell workflow and codespellignore

.github/workflows/codespell.yml

@@ -0,0 +1,31 @@
+# GitHub Action to automate the identification of common misspellings in text files.
+# https://github.com/codespell-project/actions-codespell
+# https://github.com/codespell-project/codespell
+
+name: Codespell
+on: 
+  pull_request:
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Get changed files
+      id: changed-files
+      uses: tj-actions/changed-files@v12.2
+
+    - name: List all changed files
+      run: |
+        for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
+          echo "$file was changed"
+        done
+
+    - uses: codespell-project/actions-codespell@master
+      with:
+        check_filenames: true
+        ignore_words_file: .github/codespellignore
+        skip: ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml,./build/
+        path: ${{ steps.changed-files.outputs.all_changed_files }}