add installation guidelines to the README file (golang-jwt#204)

Author: luigimorel

README.md

@@ -36,6 +36,20 @@ The part in the middle is the interesting bit.  It's called the Claims and conta
 
 This library supports the parsing and verification as well as the generation and signing of JWTs.  Current supported signing algorithms are HMAC SHA, RSA, RSA-PSS, and ECDSA, though hooks are present for adding your own.
 
+## Installation Guidelines
+
+1. To install the jwt package, you first need to have [Go](https://go.dev/doc/install) installed, then you can use the command below to add `jwt-go` as a dependency in your Go program.
+
+```sh
+go get -u github.com/golang-jwt/jwt/v4
+```
+
+2. Import it in your code:
+
+```go
+import "github.com/golang-jwt/jwt/v4"
+```
+
 ## Examples
 
 See [the project documentation](https://pkg.go.dev/github.com/golang-jwt/jwt/v4) for examples of usage: