Create README.md

Author: mythz

llms/extensions/system_prompts/README.md

@@ -0,0 +1,22 @@
+# System Prompts Extension
+
+This extension configures AI requests with a library of **over 200+** awesome curated system prompts that can be selected from the UI.
+
+## Custom System Prompts
+
+You can also maintain your own library of system prompts which can be maintained for all anonymous users at:
+`~/.llms/user/default/system-prompts.json`
+
+Or for signed in users at:
+`~/.llms/user/<github-user>/system-prompts.json`
+
+The JSON file should contain an array of Prompt objects, e.g:
+
+```json
+[
+    {
+        "name": "Helpful Assistant",
+        "prompt": "You are a helpful assistant."
+    }
+]
+```