[".gitignore"文件的变更主要是新增了一个忽略规则，属于修改配置类型，而未跟踪的文件表明新增了一些项目依赖和源码目录，属于新增功能或依赖更新类型。综合分析如下：]

🔧 Add `.idea/` to .gitignore and introduce new project dependencies/files including `.python-version`, `pyproject.toml`, and `src/` directory.

.gitignore

@@ -1,3 +1,4 @@
+.idea/
 # ---> macOS
 # General
 .DS_Store

.python-version

@@ -0,0 +1 @@
+3.12

pyproject.toml

@@ -0,0 +1,14 @@
+[project]
+name = "py-common-lib"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+authors = [
+    { name = "Hatter Jiang", email = "jht5945@gmail.com" }
+]
+requires-python = ">=3.12"
+dependencies = []
+
+[build-system]
+requires = ["uv_build>=0.11.6,<0.12.0"]
+build-backend = "uv_build"

src/py_common_lib/__init__.py

@@ -0,0 +1,2 @@
+def hello() -> str:
+    return "Hello from py-common-lib!"