Update README with installation instructions and header

Added installation instructions and a header image.

Author: Anon4You

README.md

@@ -1,2 +1,19 @@
-# OpenBullet2-termux
-Openbullet2 termux void
+<a href="https://github.com/openbullet/openbullet2">
+  <h1 align="center">
+    <picture>
+      <source media="(prefers-color-scheme: dark)" srcset="https://camo.githubusercontent.com/13a7ad571b8fc76f3cf4f919a49853050ed80296f9930b87f7a5be3beef2151c/68747470733a2f2f692e696d6775722e636f6d2f73546f456b4a432e706e67">
+      <img alt="OpenBullet2" src="https://camo.githubusercontent.com/13a7ad571b8fc76f3cf4f919a49853050ed80296f9930b87f7a5be3beef2151c/68747470733a2f2f692e696d6775722e636f6d2f73546f456b4a432e706e67">
+    </picture>
+  </h1>
+</a>
+
+Run OpenBullet2 directly on your Android device using the Termux terminal emulator.
+
+## 🚀 Installation
+
+Open Termux and run the following command:
+
+```bash
+apt install openbullet2 -y
+```
+> Note make sure you have termuxvoid in your source