feat: add pyproject.toml for PEP 517/518 build support and update installation instructions

@todo.md

@@ -24,7 +24,7 @@
 ### Packaging & Distribution
 - [x] Publish to PyPI
 - [x] Provide `uv`/`pipx` installation guide.
-- [ ] Add `pyproject.toml` and PEP 517/518 build backend.
+- [x] Add `pyproject.toml` and PEP 517/518 build backend.
 - [ ] Arch AUR PKGBUILD (devtools-bin and devtools-git).
 
 ### Quality: Testing & Linting

README.md

@@ -8,9 +8,19 @@ A collection of developer tools to enhance your workflow. This package includes
 # Stable release from PyPI
 pip install devtools-utils
 
-# Using pipx
+# Using pipx (recommended for isolated CLI)
 pipx install devtools-utils
 
+# Using uv (fast Python package manager)
+uv tool install devtools-utils
+```
+
+Arch Linux prerequisites (for pipx/uv):
+
+```bash
+sudo pacman -S --needed python python-pip python-pipx git
+# optional: uv via pipx
+pipx install uv
 ```
 
 ## Configuration
@@ -478,6 +488,15 @@ python3 scripts/lintfix.py
 devtools --help
 ```
 
+Build from source (PEP 517):
+
+```bash
+# Requires pyproject.toml
+python -m build
+# or with uv
+uv build
+```
+
 ## Contributing
 
 Contributions are welcome! Please open issues or submit pull requests.

pyproject.toml

@@ -0,0 +1,46 @@
+[build-system]
+requires = ["setuptools>=61", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "devtools-utils"
+version = "0.1.0"
+description = "A collection of developer tools"
+readme = "README.md"
+requires-python = ">=3.7"
+authors = [
+  { name = "Sankalp Tharu", email = "sankalptharu50028@gmail.com" },
+]
+license = { text = "GPL-3.0-or-later" }
+keywords = ["devtools", "cli", "git", "changelog", "gitignore", "license"]
+classifiers = [
+  "Development Status :: 3 - Alpha",
+  "Intended Audience :: Developers",
+  "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+]
+dependencies = [
+  "click>=8.0.0",
+  "rich>=10.0.0",
+  "requests>=2.25.0",
+  "pyyaml>=5.0.0",
+]
+
+[project.urls]
+Homepage = "https://github.com/S4NKALP/DevTools"
+
+[project.scripts]
+devtools = "devtools.cli:cli"
+
+[tool.setuptools]
+include-package-data = true
+
+[tool.setuptools.packages.find]
+include = ["devtools*"]
+
+