Add contributing section for new rule creation

Author: marc0der

README.md

@@ -11,6 +11,16 @@ A collection of rules that MAY be useful for your LLM projects.
 
 Like [Awesome Cursor rules](https://github.com/PatrickJS/awesome-cursorrules), except some level of curation and review
 
+# Contributing New Rules
+
+To contribute new rules, use the template format in `prompts/00-rules-template.md`. Generate rules with a meta-prompt like:
+
+```
+Please generate me a new rule formatted according to prompts/00-rules-template.md that summarises the principles of [topic/methodology] in under 200 lines.
+```
+
+This ensures consistent structure and keeps rules focused and actionable.
+
 # Prompts
 
 Prompt templates and snippets