added readme

README.md

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+# What is this?
+Welcome! This repository is the source code behind the page [sasserisop.com/MATH201](https://sasserisop.com/MATH201)
+The notes are originally written in markdown. In my case, I write my notes using obsidian during the lecutre and revise it when I'm home, although I am trying to move away from that piece of software. The notes are stored as .md files under the folder content. They are then built into a website using HUGO, a static site generator. I used a theme called [Zettles](https://github.com/crisrojas/Zettels). I have slightly modified it so that it can render math using KaTeX.
+
+# Can I contribute?
+Yes! Absolutely! You can add your own notes or fixes or anything really. You can contribute by creating an issue or by making a pull request. You can also contact me directly if you have any suggestions or concerns: [mail@sasserisop.com](mailto:mail@sasserisop.com) Please note that I will not accept adding instructor materials without their prior consent. I also do not condone academic dishonesty.
+# Can I steal your repository and host my own notes server?
+Yes. Consider sharing it with your classmates ;)
+
+# Can I add my own notes? And for other classes?
+Yes. You might need to contact me directly so we can get it to work.
+
+# Todo:
+-[] Notes could really use some more mathematical rigor.
+Notes could also be more clear and concise.
+Add a search by tag feature.
+