doc: config-path input

README.md

@@ -200,8 +200,9 @@ Action currently accepts the following options:
 
 - uses: redhat-plumbers-in-action/devel-freezer@v1
   with:
-    pr-number: <number>
-    token: <GitHub token>
+    pr-number:    <number>
+    config-path:  <path to config file>
+    token:        <GitHub token>
 
 # ...
 ```
@@ -213,6 +214,13 @@ Pull Request number.
 * default value: `${{ github.event.number }}`
 * requirements: `required`
 
+### config-path
+
+Path to configuration file. Configuration file format is described in: [Policy section](#policy).
+
+* default value: `.github/development-freeze.yml`
+* requirements: `optional`
+
 ### token
 
 Token used to create comments. Minimal required permissions are `contents: read` and `pull-requests: write`
@@ -263,4 +271,4 @@ The message that is going to be displayed in form of a comment when development
 
 The message that is going to replace the development freeze message when development freeze conditions are no longer met. Support for a multi-line string using `|` YAML syntax.
 
-* requirements: `required`
+* requirements: `required`