Add startCase function

[engfragui]

Addresses #62

New function startCase() that returns the Start case version of the input String.

👋 This is my first PR in this repo, please provide all the feedbacks you can. Thank you

[codecov-io]

Codecov Report

Merging #94 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #94      +/-   ##
============================================
+ Coverage     98.87%   98.87%   +<.01%     
- Complexity      202      206       +4     
============================================
  Files             3        3              
  Lines          4183     4187       +4     
  Branches         55       55              
============================================
+ Hits           4136     4140       +4     
  Misses           24       24              
  Partials         23       23

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/strman/Strman.java	86.91% <100%> (+0.15%)	204 <4> (+4)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7b552eb...f13ea25. Read the comment docs.