Separate build instructions for Windows and Unix into separate sections in README.md (#664)

Author: mcbarton

.github/workflows/markdown-linter.yml

@@ -36,4 +36,5 @@ jobs:
           VALIDATE_ALL_CODEBASE: false
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           VALIDATE_MARKDOWN: true
-          DEFAULT_BRANCH: ${{ github.base_ref }}
+          DEFAULT_BRANCH: ${{ github.base_ref }}
+          MARKDOWN_LINT_CONFIG_FILE: .markdownlint.json

.markdownlint.json

@@ -0,0 +1,3 @@
+{
+  "no-duplicate-heading": false
+}