Added APIMatic GitHub App (#581)

I am doing well, this is the first PR I've ever merged from the comfort of bed in my new canal boat!! 

Looking good @aliraza1231, thank you.

Author: aliraza1231

_data/tools.yml

@@ -552,6 +552,19 @@
   v2: true
   v3: true
   v3_1: true
+  
+- name: APIMatic OpenAPI Linter - GitHub App
+  category:
+  - description-validators
+  language: Any
+  link: https://github.com/marketplace/apimatic-openapi-linter
+  description: >
+    The APIMatic OpenAPI Linter GitHub App automatically validates and lints your OpenAPI definitions within GitHub repositories. 
+    Every time you create or update a pull request, the app ensures your API definitions meet high standards for both code generation and documentation generation, 
+    helping you maintain consistency and quality across your API projects.
+  v2: false
+  v3: true
+  v3_1: true
 
 - name: VSCode OpenAPI Editor
   category: text-editors