Update to dual license: Apache 2.0 (Research) + Commercial License

- Changed from Apache 2.0 only to dual license model
- Apache 2.0 for research, education, and non-commercial use
- Commercial license required for profit-making use
- Added citation requirement as condition of use for academic purposes
- Created CITATION.cff file for automatic citation suggestions
- Updated LICENSE, LICENSE.txt, README.md, and documentation
- Citation formats provided (BibTeX and text)
- Contact information for commercial licensing inquiries

LICENSE

@@ -1,17 +1,45 @@
-Apache License
-Version 2.0, January 2004
-http://www.apache.org/licenses/
+Dual License: Apache 2.0 (Research) + Commercial License (Commercial Use)
 
 Copyright (c) 2024 Carlos Gutierrez
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
+This software is available under two licenses:
 
-    http://www.apache.org/licenses/LICENSE-2.0
+1. APACHE 2.0 LICENSE (for research and non-commercial use)
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+   http://www.apache.org/licenses/LICENSE-2.0
+
+   This license applies to:
+   - Academic research
+   - Educational purposes
+   - Personal projects
+   - Open source contributions
+   - Non-commercial use
+
+2. COMMERCIAL LICENSE (for commercial/profit-making use)
+   For commercial use, including but not limited to:
+   - Commercial products or services
+   - SaaS applications
+   - Revenue-generating applications
+   - Internal business use
+   - Any use that generates profit
+
+   Please contact: carlos.gutierrez@carg.dev
+   Subject: Commercial License Inquiry - SheepOp
+
+   Commercial licensing terms will be provided upon request.
+
+3. CITATION REQUIREMENT (for academic use)
+   If you use this software in academic research or publications, you MUST cite:
+   
+   Carlos Gutierrez. (2024). SheepOp LLM: Transformer-based Language Model 
+   Implementation. https://github.com/[your-username]/sheepOp
+   
+   Citation is a condition of use for academic purposes under this license.
 
 Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
+distributed under the Apache License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
+See the Apache License for the specific language governing permissions and
 limitations under the License.