docs: add contributing guide

Author: js2me

.changeset/fancy-toys-wait.md

@@ -0,0 +1,5 @@
+---
+"mobx-tanstack-query": patch
+---
+
+docs: add contributing guide for README

README.md

@@ -32,3 +32,13 @@ const query = new Query({
   }
 })
 ```
+
+
+## Contributing Guide    
+
+1. Fork repository   
+2. Switch to `master` branch
+3. Fix bugs or create features
+4. Use command `pnpm changeset` to describe what you do   
+5. Commit with message using [Conventional commits](https://www.conventionalcommits.org/)  
+6. Open PR!