IVGCVSW-5365 'Create the TfLite Delegate subdirectory in ArmNN'

* Created delegate sub-directory under armnn
* Created Delegate, ArmnnSubgraph and DelegateOptions classes
* Created cmake files.
* Integrated doctest (under MIT license) as testing framework

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: If725ebd62c40a97c783cdad22bca48709d44338c
diff --git a/delegate/cmake/Modules/FindTensorflow.cmake b/delegate/cmake/Modules/FindTensorflow.cmake
new file mode 100644
index 0000000..8b47d30
--- /dev/null
+++ b/delegate/cmake/Modules/FindTensorflow.cmake
@@ -0,0 +1,30 @@
+#
+# Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+# SPDX-License-Identifier: MIT
+#
+
+include(FindPackageHandleStandardArgs)
+unset(TENSORFLOW_FOUND)
+
+find_path(Tensorflow_INCLUDE_DIR
+        NAMES
+            tensorflow/core
+            tensorflow/cc
+            third_party
+        HINTS
+            ${TENSORFLOW_ROOT})
+
+find_library(Tensorflow_LIB
+        NAMES
+            tensorflow_all
+        HINTS
+            ${TENSORFLOW_ROOT})
+
+## Set TENSORFLOW_FOUND
+find_package_handle_standard_args(Tensorflow DEFAULT_MSG Tensorflow_INCLUDE_DIR Tensorflow_LIB)
+
+## Set external variables for usage in CMakeLists.txt
+if(TENSORFLOW_FOUND)
+    set(Tensorflow_LIB ${Tensorflow_LIB})
+    set(Tensorflow_INCLUDE_DIRS ${Tensorflow_INCLUDE_DIR})
+endif()
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