feat: Add parameter to change output file name (#24)

Co-authored-by: Lukasz Gornicki <lpgornicki@gmail.com>

README.md

@@ -14,6 +14,11 @@ If you don't have the AsyncAPI Generator installed, you can install it like this
 ```
 npm install -g @asyncapi/generator
 ```
+## Supported parameters
+
+|Name|Description|Required|Default|Example|
+|---|---|---|---|
+|outFilename|The filename of the output file.|No|`asyncapi.md`|`index.md`|
 
 ## Development
 
@@ -40,4 +45,4 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 <!-- prettier-ignore-end -->
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
-This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!

hooks/output-filename.js

@@ -0,0 +1,10 @@
+const fs = require('fs');
+
+module.exports = {
+    'generate:after': generator => {
+        if(generator.templateParams.outFilename !== 'asyncapi.md') {
+            fs.renameSync(`${generator.targetDir}/asyncapi.md`,
+                `${generator.targetDir}/${generator.templateParams.outFilename}`);
+        }
+    }
+}

package.json

@@ -63,6 +63,13 @@
     "generator": ">=0.50.0 <2.0.0",
     "filters": [
       "@asyncapi/generator-filters"
-    ]
+    ],
+    "parameters": {
+      "outFilename": {
+        "description": "The name of the output markdown file",
+        "default": "asyncapi.md",
+        "required": false
+      }
+    }
   }
 }