Add Qualcomm HTP specific doc for library and model

Author: kirklandsign

examples/demo-apps/android/ExecuTorchDemo/README.md

@@ -123,6 +123,15 @@ cp ./examples/demo-apps/android/jni/libexecutorchdemo.so \
    ../examples/demo-apps/android/ExecuTorchDemo/app/src/main/jniLibs/arm64-v8a
 ```
 
+3. *Qualcomm HTP Only:* Copy Qualcomm HTP runtime library
+
+If Qualcomm HTP backend is used, then we need to copy additional libraries from Qualcomm SDK artifacts:
+
+```bash
+cp libQnnHtp.so libQnnHtpV69Skel.so libQnnHtpStub.so libQnnSystem.so \
+   ../examples/demo-apps/android/ExecuTorchDemo/app/src/main/jniLibs/arm64-v8a
+```
+
 Later, this shared library will be loaded by `NativePeer.java` in Java code.
 
 Then return to the `executorch` directory:
@@ -146,6 +155,12 @@ mkdir -p examples/demo-apps/android/ExecuTorchDemo/app/src/main/assets/
 cp dl3_xnnpack_fp32.pte ic4_xnnpack_fp32.pte examples/demo-apps/android/ExecuTorchDemo/app/src/main/assets/
 ```
 
+2. *Qualcomm HTP Only:* Copy HTP delegation models to the app:
+
+```bash
+cp dlv3_qnn.pte ic4_qnn.pte examples/demo-apps/android/ExecuTorchDemo/app/src/main/assets/
+```
+
 ## Final Steps
 
 1. Open the project `examples/demo-apps/android/ExecuTorchDemo` with Android Studio.