IVGCVSW-5379 'TfLiteDelegate: Implement the ElementWiseBinary operators'

* Implemented ADD operator
* Implemented FP32 unit tests for ADD operator

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: Id7238749308855bd2b2118f4b6e60e765815c38f
diff --git a/delegate/CMakeLists.txt b/delegate/CMakeLists.txt
index aa48435..acce828 100644
--- a/delegate/CMakeLists.txt
+++ b/delegate/CMakeLists.txt
@@ -89,6 +89,8 @@
 set(armnnDelegate_unittest_sources)
 list(APPEND armnnDelegate_unittest_sources
         src/test/ArmnnDelegateTest.cpp
+        src/test/ElementwiseBinaryTest.cpp
+        src/test/ElementwiseBinaryTestHelper.hpp
         src/test/ElementwiseUnaryTest.cpp
         src/test/ElementwiseUnaryTestHelper.hpp)