docs: update README and add test infrastructure

- Enhance .gitignore with comprehensive Python patterns
- Improve README with better setup and testing instructions
- Add test infrastructure:
  * Test requirements file
  * Environment setup script
  * Test runner script
  * Comprehensive test suite
  * Coverage configuration

.coveragerc

@@ -0,0 +1,14 @@
+[run]
+source = .
+omit = 
+    */venv/*
+    */tests/*
+    */.venv/*
+
+[report]
+exclude_lines =
+    pragma: no cover
+    def __repr__
+    raise AssertionError
+    raise NotImplementedError
+    if __name__ == .__main__.: