Add the doc for a pokemon API

Projects/2-Intermediate/Pokemon-API.md

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+# Pokemon API
+
+**Tier:** 2-Intermediate
+
+Create a Pokemon API using Go languaje
+
+- Basic of Go languaje
+- Net-HTTP package
+
+## Features
+
+- [ ] Users can create a Pokemon
+- [ ] Users can retrieve a Pokemon
+
+### Nice to have
+
+- [ ] Use a DB, S3, CSV file or any other storage service to store the pokemons
+- [ ] Create a client to retrieve information from an external API
+
+## Docs
+
+- [A tour of Go](https://tour.golang.org)
+- [Net/HTTP](https://pkg.go.dev/net/http)