Add GitHub Actions workflow and integration documentation for treefmt and dprint

Co-authored-by: neongreen <1523306+neongreen@users.noreply.github.com>

Author: Copilot

.github/workflows/markdown-format.yml

@@ -0,0 +1,26 @@
+name: markdown-format
+
+on:
+  push:
+    paths:
+      - 'markdown-format/**'
+  pull_request:
+    paths:
+      - 'markdown-format/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.7'
+      
+      - name: Run tests
+        working-directory: markdown-format
+        run: go test -v

markdown-format/README.md

@@ -59,6 +59,92 @@ It has multiple sentences.
 Let's format it!
 ```
 
+## Integration with Formatting Tools
+
+### treefmt
+
+[treefmt](https://github.com/numtide/treefmt) is a universal code formatter that runs multiple formatters with one command.
+
+To integrate markdown-format with treefmt, you'll need to create a wrapper script since markdown-format outputs to stdout rather than formatting files in place.
+
+1. Create a wrapper script (e.g., `markdown-format-inplace.sh`):
+
+```bash
+#!/bin/bash
+# Wrapper script to make markdown-format work in-place for treefmt
+
+MARKDOWN_FORMAT="./markdown-format/markdown-format"
+
+for file in "$@"; do
+    if [ -f "$file" ]; then
+        temp_file=$(mktemp)
+        "$MARKDOWN_FORMAT" "$file" > "$temp_file"
+        mv "$temp_file" "$file"
+    fi
+done
+```
+
+2. Make the wrapper script executable:
+
+```bash
+chmod +x markdown-format-inplace.sh
+```
+
+3. Add to your `treefmt.toml`:
+
+```toml
+[formatter.markdown-format]
+command = "./markdown-format-inplace.sh"
+options = []
+includes = ["*.md"]
+```
+
+4. Run treefmt:
+
+```bash
+treefmt
+```
+
+### dprint
+
+[dprint](https://dprint.dev/) is a pluggable and configurable code formatter.
+
+Since markdown-format uses a custom sentence-per-line format, you'll need to use dprint's process plugin or create a custom wrapper. Here's how to integrate using a process-based approach:
+
+1. Create a wrapper script that handles dprint's stdin/stdout protocol (e.g., `dprint-markdown-format.sh`):
+
+```bash
+#!/bin/bash
+# Wrapper script for dprint integration
+
+# Read from stdin, format, and output to stdout
+/path/to/markdown-format -
+```
+
+2. Add to your `dprint.json`:
+
+```json
+{
+  "plugins": [
+    "https://plugins.dprint.dev/exec-0.5.0.json@checksum"
+  ],
+  "exec": {
+    "commands": [{
+      "command": "./dprint-markdown-format.sh",
+      "exts": ["md"]
+    }]
+  }
+}
+```
+
+Note: The exact configuration may vary depending on your dprint version. Refer to the [dprint documentation](https://dprint.dev/plugins/) for the latest plugin configuration format.
+
+3. Run dprint:
+
+```bash
+dprint fmt
+```
+
 ## License
 
 MIT License - See LICENSE file in the repository root.