add README

Author: Arcelyth

README.md

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+# TerminalVirtualKeyboard
+
+A high-performance, real-time, customizable terminal virtual keyboard written in Rust, powered by RataTUI
+
+## Usage 
+
+```
+tvk <tvkl_file>
+```
+
+## Snapshot
+
+![snapshot](./snapshot.png)
+
+## TVKL
+
+The tvkl, Terminal Virtual Keyboard Layout, is a format used to represent your keyboard layout which makes customization easlier and more ergonomic <br>
+
+You can check the tvkl grammar here: [tvkl](./tvkl/grammar/tvkl.gram) <br>
+There are some examples here: [layouts](./layouts) <br>