Update README.md

android/fedmlsdk/MobileNN/README.md

@@ -27,7 +27,7 @@ sh build_x86_linux.sh
 2. MNN compilation artifacts under `build/mnn_binary_dir`
    * libMNN: Backend Shared Library 
    * libMNNTrain: Training Framework Shared Library 
-   * libMNNExpr: Express Training API Shared Lirary
+   * libMNNExpr: Express Training API Shared Library
 3. To run `demo.out` on your linux/macOS machine, first download MNIST dataset from [Google Drive](https://drive.google.com/drive/folders/1IB1-NJgzHSEb7ucgJzM2Gj8QzxpYAjGy?usp=sharing), and run `./demo.out /path/to/data/mnist_data`. 
 To run `demo.out` on your android device, adb push mnist_data to your android device under `/data/local/tmp` before running `./test_arm_android_64.sh`.