Update README.md

Author: michelbernardods

README.md

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     Desafios de programação backend, frontend e pentest e competições para aprimorar o conhecimento.
 
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 >>>>> #### [BACKEND CHALLENGES](./CHALLENGES/BACKEND-CHALLENGES.md) | [FRONTEND CHALLENGES](./CHALLENGES/FRONTEND-CHALLENGES.md) | [PENTEST CHALLENGES](./CHALLENGES/PENTEST-CHALLENGES.md) 
 
 
 
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 <details>
 	<summary> <strong> How to contribute </strong> </summary>