Add Generate A Signed JWT Token as a ruby til

ruby/generate-a-signed-jwt-token.md

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+# Generate A Signed JWT Token
+
+The [`jwt`](https://github.com/jwt/ruby-jwt) gem is a Ruby library for
+encoding and decoding JWT tokens. You can create a signed JWT with the
+`#encode` method by specifying a secret and a hash algorithm.
+
+```ruby
+payload = { id: 1, email: 'user@example.com' }
+secret = Rails.application.credentials.secret_key_base
+
+token = JWT.encode(payload, secret, 'HS256')
+```
+
+This will create a JWT token that contains some JWT headers, application
+data, and an encrypted secret that signs the data. This can be passed to and
+from your client app as a way of identifying and authenticating a user.
+
+See the [`jwt-ruby` docs](https://github.com/jwt/ruby-jwt) or
+[jwt.io](https://jwt.io/) for more details.