Added README.md

- Fixes #1

README.md

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+# 📅 EIICAL
+
+> An API wrapper for the EII Schedule webpage which adds additional functionality such as ical format.
+
+## Routes
+
+| Variables           |  Format   |                  Example |
+| ------------------- | :-------: | -----------------------: |
+| Year                |  `y1-y2`  | `23-24` - Year 2023-2024 |
+| Semester            |   `sx`    |    `s1` - First semester |
+| University username | `UOxxxxx` |               `UO294054` |
+
+#### MAIN
+
+> eiical.diegomcha.workers.dev/**cal**/**y1-y2**/**sx**/**UOxxxxx**
+
+Redirects the user to the official user page:
+![Page where the user is redirected](images/image.png)
+
+#### CSV
+
+> eiical.diegomcha.workers.dev/**cal**/**y1-y2**/**sx**/**UOxxxxx**/**csv**
+
+Downloads the user calendar in CSV format. This file is generated by the official page.
+
+#### ICAL
+
+> eiical.diegomcha.workers.dev/**cal**/**y1-y2**/**sx**/**UOxxxxx**/**ical**
+
+Downloads the user calendar in ICAL format. This file is generated by the from the official CSV. This calendar can be subscribed to.
+
+## Caching
+
+- [**AFFECTS ALL ROUTES!**] **Groups** to which each user belong are cached for **a week**.
+
+- **ICAL** calendar is cached for **12h**.
+- The rest of the routes dont implement a cache.