Add copyright headers

[odow]

x-ref: jump-dev/AmplNLWriter.jl#155

[codecov]

Codecov Report

Merging #76 (46a47ea) into master (3c59490) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #76   +/-   ##
=======================================
  Coverage   54.01%   54.01%           
=======================================
  Files           9        9           
  Lines         809      809           
=======================================
  Hits          437      437           
  Misses        372      372           

Impacted Files	Coverage Δ
src/CSDP.jl	100.00% <ø> (ø)
src/MOI_wrapper.jl	83.63% <ø> (ø)
src/blockdiag.jl	83.33% <ø> (ø)
src/blockmat.h.jl	69.23% <ø> (ø)
src/blockmat.jl	61.93% <ø> (ø)
src/debug-mat.jl	0.00% <ø> (ø)
src/declarations.h.jl	18.44% <ø> (ø)
src/declarations.jl	39.80% <ø> (ø)
src/options.jl	45.45% <ø> (ø)

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