MLCE-545 INT8 TFLite model execution abnormal

 * Add functionality to print output tensors to file in tempdir
 * UnitTests

Signed-off-by: Keith Davis <keith.davis@arm.com>
Change-Id: Idfb4c186544187db1fecdfca11c662540f645439
diff --git a/include/armnnUtils/Filesystem.hpp b/include/armnnUtils/Filesystem.hpp
index 0d29a75..00da50f 100644
--- a/include/armnnUtils/Filesystem.hpp
+++ b/include/armnnUtils/Filesystem.hpp
@@ -19,9 +19,16 @@
 namespace Filesystem
 {
 
+using FileContents = std::string;
+
 /// Returns a path to a file in the system temporary folder. If the file existed it will be deleted.
 fs::path NamedTempFile(const char* fileName);
 
+/// Returns full path to temporary folder
+std::string CreateDirectory(std::string sPath);
+
+FileContents ReadFileContentsIntoString(const std::string path);
+
 } // namespace armnnUtils
 } // namespace Filesystem