Add Copyright and LICENSE files

[vatanaksoytezer]

Adresses ros/rosdistro#29951 with ament_copyright

[codecov]

Codecov Report

Merging #65 (ef1568a) into ros2 (92049bd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             ros2      #65   +/-   ##
=======================================
  Coverage   72.73%   72.73%           
=======================================
  Files           5        5           
  Lines         242      242           
=======================================
  Hits          176      176           
  Misses         66       66           

Impacted Files	Coverage Δ
include/warehouse_ros_mongo/message_collection.h	100.00% <ø> (ø)
include/warehouse_ros_mongo/metadata.h	38.21% <ø> (ø)
src/database_connection.cpp	84.79% <ø> (ø)
src/message_collection.cpp	94.29% <ø> (ø)
src/query_results.cpp	100.00% <ø> (ø)

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