update installation doc for sgl-kernel (#3129)

.github/workflows/pr-test-sgl-kernel.yml

@@ -31,7 +31,7 @@ jobs:
           style: file
 
   build-wheels:
-    if: github.repository == 'sgl-project/sglang'
+    if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     strategy:
       matrix:

sgl-kernel/README.md

 # SGL Kernel
 
-Kernel Library for SGLang
+[Kernel Library](https://github.com/sgl-project/sglang/tree/main/sgl-kernel) for SGLang
 
 [![PyPI](https://img.shields.io/pypi/v/sgl-kernel)](https://pypi.org/project/sgl-kernel)
+
+## Installation
+
+For CUDA 11.8:
+
+```bash
+pip3 install sgl-kernel -i https://docs.sglang.ai/whl/cu118
+```
+
+For CUDA 12.1 or CUDA 12.4:
+
+```bash
+pip3 install sgl-kernel
+```

sgl-kernel/pyproject.toml

@@ -17,7 +17,7 @@ classifiers = [
 dependencies = []
 
 [project.urls]
-"Homepage" = "https://github.com/sgl-project/sglang"
+"Homepage" = "https://github.com/sgl-project/sglang/tree/main/sgl-kernel"
 "Bug Tracker" = "https://github.com/sgl-project/sglang/issues"
 
 [tool.setuptools]