add string parser

[enescakir]

• [x] add parser
• [x] generate emoji map with generator
• [x] add fmt methods
• [x] add unit tests to parser
• [x] add unit tests to fmt
• [x] add new feature to README

[codecov-io]

Codecov Report

Merging #4 into master will increase coverage by 4.87%. The diff coverage is 100%.

@@           Coverage Diff            @@
##           master     #4      +/-   ##
========================================
+ Coverage   95.12%   100%   +4.87%     
========================================
  Files           1      3       +2     
  Lines          41    108      +67     
========================================
+ Hits           39    108      +69     
+ Misses          1      0       -1     
+ Partials        1      0       -1

Impacted Files	Coverage Δ
emoji.go	100% <ø> (+4.87%)	:arrow_up:
fmt.go	100% <100%> (ø)
parser.go	100% <100%> (ø)

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