Update install docs and packaging metadata

Author: s-rani1

README.md

@@ -18,11 +18,18 @@ analyses are interchangeable between languages.
 ## Installation
 
 ```bash
-# Editable install (recommended for development)
-pip install -e ".[dev,plot]"
+# Install from PyPI (recommended for users)
+pip install latrend
+```
 
-# Minimal install (matplotlib-only plotting)
-pip install -e .
+```bash
+# Install latest from GitHub (before/without PyPI release)
+pip install "git+https://github.com/s-rani1/latrend-py.git"
+```
+
+```bash
+# Editable install (development)
+pip install -e ".[dev,plot]"
 ```
 
 ## Quickstart

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=61", "wheel"]
+requires = ["setuptools>=61,<77", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -62,6 +62,7 @@ Changelog = "https://github.com/s-rani1/latrend-py/blob/main/CHANGELOG.md"
 
 [tool.setuptools]
 package-dir = { "" = "src" }
+license-files = []
 
 [tool.setuptools.packages.find]
 where = ["src"]