Provide use case examples with several libraries

[emyann]

• Examples folder.
  • Reverse Map: https://repl.it/@yrnd1/Morphism-ReverseMap
  • Map towards a complex structure: https://stackblitz.com/edit/morphism-issues-50?file=index.ts
  • Redux
  • RxJs
  • Axios interceptor
  • Decorators