Added ParseMean method to TfLiteParser

Change-Id: Idfedf82479fb3d4bb2962fc3cfc6c76e57331943
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ef8038b..134fd10 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -452,6 +452,7 @@
              src/armnnTfLiteParser/test/DepthwiseConvolution2D.cpp
              src/armnnTfLiteParser/test/FullyConnected.cpp
              src/armnnTfLiteParser/test/MaxPool2D.cpp
+             src/armnnTfLiteParser/test/Mean.cpp
              src/armnnTfLiteParser/test/Multiplication.cpp
              src/armnnTfLiteParser/test/Reshape.cpp
              src/armnnTfLiteParser/test/Softmax.cpp