readme : update Android build instructions (#1922)

Add steps for using termux on android devices to prevent common errors.
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Mike 2023-06-18 16:28:26 +08:00 committed by GitHub
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@ -617,7 +617,12 @@ And after 4.45 hours, you will have the final perplexity.
#### Building the Project using Android NDK
You can easily run `llama.cpp` on Android device with [termux](https://termux.dev/).
First, obtain the [Android NDK](https://developer.android.com/ndk) and then build with CMake:
First, install the essential packages for termux:
```
pkg install clang wget git cmake
```
Second, obtain the [Android NDK](https://developer.android.com/ndk) and then build with CMake:
```
$ mkdir build-android
$ cd build-android