Patch 1 (intel#4)

* Update kp2rig.md

* Update kp2rig.md

* Update main.cpp

* Update main.cpp

* Create code_of_conduct.md

* Renamed code_of_conduct.md to uppercase

* Create SECURITY.md

* Create CONTRIBUTING.md

* Update README.md

* Removed outdated rig file from test data

* Update README.md

* Update README.md

* Modified header in CMakeLists.txt

* Removed incorrect comment in rig2blender.sh