fix README.md

Author: shinagawa-web

.github/workflows/test.yml

@@ -14,7 +14,4 @@ jobs:
       - name: Run gomarklint Action
         uses: ./
         with:
-          args: |
-            --config
-            testdata/.gomarklint.json
-            testdata/markdown_files
+          args: testdata

testdata/.gomarklint.json .gomarklint.jsontestdata/.gomarklint.json renamed to .gomarklint.json

@@ -1,6 +1,17 @@
 # gomarklint-action
 
 Lint Markdown files using [gomarklint](https://github.com/shinagawa-web/gomarklint) in GitHub Actions.
+## 🚀 Prerequisites
+
+Before using this action, please generate a `.gomarklint.json` config file with:
+
+```bash
+gomarklint init
+```
+
+This config file is required. If it is missing, the action will fail.
+
+See the [gomarklint documentation](https://github.com/shinagawa-web/gomarklint/blob/main/README.md) for details.
 
 ## Usage
 

README.md

@@ -1,10 +1,13 @@
 #!/bin/sh
 set -e
 
-if [ -f ".gomarklint.json" ]; then
-  echo "✅ Found .gomarklint.json"
+CONFIG_FILE=".gomarklint.json"
+
+if [ -f "$CONFIG_FILE" ]; then
+  echo "✅ Found $CONFIG_FILE"
 else
-  echo "⚠️  .gomarklint.json not found. Proceeding with default config."
+  echo "❌ $CONFIG_FILE not found. This action requires a config file."
+  exit 1
 fi
 
 exec gomarklint "$@"