Prep first PyPI release: version 0.9.0, pip install instructions

0.9.0 rather than the placeholder 1.0.0, matching the existing Beta
classifier.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: tabishm52

README.md

@@ -10,7 +10,7 @@ During import, column names extracted from activity files are normalized into a
 ## Installation
 
 ```bash
-pip install git+https://github.com/tabishm52/activity_parser.git
+pip install activity-parser
 ```
 
 ## Usage

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "activity-parser"
-version = "1.0.0"
+version = "0.9.0"
 description = "Parser for loading FIT, TCX and GPX files into Pandas DataFrames."
 readme = "README.md"
 license = "MIT"