Add .gitignore and LICENSE files with commercial use restrictions

- Created a .gitignore file to exclude various private, environment, and temporary files from version control.
- Added an MIT License with Commercial Use Restriction, outlining terms for non-commercial and commercial use, along with definitions and attribution requirements.

Author: raphaela-nawa

day09/.gitignore

@@ -0,0 +1,61 @@
+# Private/Commercial Documentation
+PRIVATE_PRODUCT_NOTES.md
+COMMERCIAL_LICENSE.md
+STRATEGIC_NOTES.md
+*PRIVATE*.md
+*COMMERCIAL*.md
+
+# dbt artifacts
+target/
+dbt_packages/
+logs/
+*.log
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+.venv/
+*.egg-info/
+dist/
+build/
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+
+# Database files (optional - uncomment if you don't want to commit the SQLite DB)
+# data/*.db
+# data/*.sqlite
+# data/*.sqlite3
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# OS
+Thumbs.db
+Desktop.ini
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Jupyter
+.ipynb_checkpoints/
+*.ipynb
+
+# Temporary files
+*.tmp
+*.bak
+*.backup

day09/LICENSE

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+MIT License with Commercial Use Restriction
+
+Copyright (c) 2025 Raphael Anawa
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction for NON-COMMERCIAL purposes, including
+without limitation the rights to use, copy, modify, merge, publish, and
+distribute copies of the Software for personal, educational, and portfolio
+purposes, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+COMMERCIAL USE RESTRICTION:
+Commercial use, including but not limited to offering the Software as a
+hosted service, reselling, or incorporating the Software into a commercial
+product or service, requires a separate commercial license agreement.
+
+For commercial licensing inquiries, please contact the copyright holder.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+---
+
+DEFINITIONS:
+- "Commercial use" means any use of the Software where monetary compensation
+  is received, including but not limited to SaaS offerings, consulting services
+  using the Software, or integration into commercial products.
+- "Personal use" means use for individual learning, portfolio demonstration,
+  or non-profit educational purposes.
+- "Educational use" means use in academic settings for teaching or research
+  without commercial benefit.
+
+ATTRIBUTION REQUIREMENT:
+Any use of this Software must include attribution to the original author and
+a link to the source repository.