[TT-10178] Include README.md for Enterprise Developer Portal

[oluwaseyeayinla]

Enterprise developer portal helm documentation is missing. Can a readme doc be added?

Linked from community post https://community.tyk.io/t/tyk-enterprise-developer-portal-github-helm-documentation-missing/6729

[caroltyk]

Hi @oluwaseyeayinla , please check the docs here.
https://github.com/TykTechnologies/tyk-charts/tree/main/components/tyk-dev-portal

Further documentations can be found at

1. https://tyk.io/docs/product-stack/tyk-enterprise-developer-portal/deploy/install-tyk-enterprise-portal/install-portal-using-new-helm/
2. https://tyk.io/docs/deployment-and-operations/tyk-self-managed/deployment-lifecycle/installations/kubernetes/tyk-helm-tyk-stack/