feat: add small readme

Author: illiafox

readme.md

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+# Leetcode Solutions
+
+My solutions to LeetCode challenges implemented in **Go** (mostly), **Rust** and **TypeScript**
+
+[![Tests](https://github.com/illiafox/leetcode/actions/workflows/test.yaml/badge.svg)](https://github.com/illiafox/leetcode/actions/workflows/test.yaml)
+---
+
+## License
+
+Solutions are licensed under the **Boost Software License**, as described in the `LICENSE` file.