Adding basic setup for vale (spell and style checking)

Author: spier

.github/workflows/vale.yml

@@ -0,0 +1,26 @@
+name: Spelling & Styles
+
+on:
+  push:
+    branches:
+    - main
+    paths:
+    - '**.md'
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  vale:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Vale Linting
+      uses: errata-ai/vale-action@reviewdog
+      with:
+        files: '["introduction/", "infrastructure/", "measuring/"]'
+        vale_flags: "--glob=*.md"
+        filter_mode: added
+        debug: true

.gitignore

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+# We want to ignore our vale StylesPath
+.github/vale/*

.vale.ini

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+StylesPath = .github/vale
+MinAlertLevel = suggestion
+
+Packages = https://github.com/InnerSourceCommons/isc-styles/releases/latest/download/ISC.zip
+
+[*]
+BasedOnStyles = ISC
+
+; If you **don't** want to check for the correct spelling of "InnerSource", comment this in
+; ISC.InnerSource = NO