Add Spring Boot API

[pascalgrimaud]

Fix #80

[codecov]

Codecov Report

Merging #97 (23364c5) into main (6fd1ae5) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main       #97   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       211       214    +3     
===========================================
  Files             37        38    +1     
  Lines            669       677    +8     
  Branches          20        20           
===========================================
+ Hits             669       677    +8     

Impacted Files	Coverage Δ
...hipster/forge/error/domain/GeneratorException.java	100.00% <100.00%> (ø)
...nerator/springboot/primary/SpringBootResource.java	100.00% <100.00%> (ø)

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