feat(create-rslib): add AGENTS.md

Author: Timeless0911

packages/create-rslib/template-common/AGENTS.md

@@ -0,0 +1,13 @@
+# AGENTS.md
+
+You are an expert in JavaScript, Rspack, Rsbuild, Rslib, and library development. You write maintainable, performant, and accessible code.
+
+## Commands
+
+- `npm run build` - Build the library for production
+
+## Docs
+
+- Rslib: <https://rslib.rs/llms.txt>
+- Rsbuild: <https://rsbuild.rs/llms.txt>
+- Rspack: <https://rspack.rs/llms.txt>