Rename Feature.cpp as Reader.cpp (#124)

Feature.cpp was introduced to test the self-completeness of 'Reader.h',
but with incorrect name.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>

diff --git a/libs/core/src/nncc/core/ADT/feature/Feature.cpp b/libs/core/src/nncc/core/ADT/feature/Reader.cpp
similarity index 100%
rename from libs/core/src/nncc/core/ADT/feature/Feature.cpp
rename to libs/core/src/nncc/core/ADT/feature/Reader.cpp