Replace LICENSE.txt with LICENSE.md to clarify licensing terms and provide attribution for the project based on the System Design Primer. The new LICENSE.md includes details on usage rights and modifications under the Creative Commons Attribution 4.0 International License.

LICENSE.md

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+# License
+
+## Original Content
+
+
+This project is based on the System Design Primer by Donne Martin, 
+licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0)[https://creativecommons.org/licenses/by/4.0/]. 
+
+You are free to:
+
+- **Share**: Copy and redistribute the material in any medium or format.
+- **Adapt**: Remix, transform, and build upon the material for any purpose, even commercially.
+
+Under the following terms:
+
+- **Attribution**: You must give appropriate credit, provide a link to the license, and indicate if changes were made.
+
+All modifications and additions in [System Design Primer Update](https://github.com/ido777/system-design-primer-update) are made in the spirit of open collaboration and innovation and for now are licensed under the same license as the original content but this might change in the future.
+
+
+
+
+

LICENSE.txt

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-I am providing code and resources in this repository to you under an open source
-license.  Because this is my personal repository, the license you receive to my
-code and resources is from me and not my employer (Facebook).
-
-Copyright 2017 Donne Martin
-
-Creative Commons Attribution 4.0 International License (CC BY 4.0)
-
-http://creativecommons.org/licenses/by/4.0/