Add NEG support to TFLite parser

* Added unit tests
* Updated Documentation

Signed-off-by: Darshan Patel <darsh.jp@gmail.com>
Change-Id: Id22ffebe60732a93798f72801eb8a2a23cdd7ec0
diff --git a/docs/01_parsers.dox b/docs/01_parsers.dox
index ddd17ee..e6b4a28 100644
--- a/docs/01_parsers.dox
+++ b/docs/01_parsers.dox
@@ -168,6 +168,7 @@
 - MEAN
 - MINIMUM
 - MUL
+- NEG
 - PACK
 - PAD
 - RELU