Created add row and add column buttons

[JetHughes]

Partially resolves #43. Created two buttons above the table. One for adding a row, one for adding a Column.

[JetHughes]

@ganesshkumar

[codecov-commenter]

Codecov Report

Base: 98.27% // Head: 98.27% // No change to project coverage :thumbsup:

Coverage data is based on head (bc125cb) compared to base (27096ee). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files           2        2           
  Lines         116      116           
  Branches       31       31           
=======================================
  Hits          114      114           
  Misses          2        2           

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