tools: Adding tlvdump app that visualizes TLV encoding stored in files

Change-Id: Iae29f56d5ab567653055dbbb8005f4bc10ae0dc0
diff --git a/.gitignore b/.gitignore
index ae3de42..9da7ccd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -72,3 +72,6 @@
 # Tests using Boost's unit test framework
 tests_boost/unit-tests
 
+# Tools
+tools/tlvdump
+