add requirement

speechx/README.md

@@ -70,3 +70,27 @@ popd
 
 ### Deepspeech2 with linear feature
 * DecibelNormalizer: there is a small difference between the offline and online db norm. The computation of online db norm reads features chunk by chunk, which causes the feature size to be different different with offline db norm. In `normalizer.cc:73`, the `samples.size()` is different, which causes the different result.
+
+## FAQ
+
+1. No moudle named `paddle`. 
+
+```
+CMake Error at CMakeLists.txt:119 (string):
+  string sub-command STRIP requires two arguments.
+
+
+Traceback (most recent call last):
+  File "<string>", line 1, in <module>
+ModuleNotFoundError: No module named 'paddle'
+-- PADDLE_COMPILE_FLAGS=
+CMake Error at CMakeLists.txt:131 (string):
+  string sub-command STRIP requires two arguments.
+
+
+  File "<string>", line 1
+    import os; import paddle; include_dir=paddle.sysconfig.get_include(); paddle_dir=os.path.split(include_dir)[0]; libs_dir=os.path.join(paddle_dir, 'libs'); fluid_dir=os.path.join(paddle_dir, 'fluid'); out=':'.join([libs_dir, fluid_dir]); print(out);     
+    ^
+```
+
+please install paddlepaddle >= 2.4rc

speechx/requirement.txt

@@ -0,0 +1 @@
+paddlepaddle>=2.4rc