Resolve issue#12 (#13)

Clarify project purpose in README

* Update godoc link to point to v2 version.
* Add more sub-sections explaining project purpose.
* Add sub-sections for installation and usage.

Closes #12

README.md

@@ -1,3 +1,21 @@
-[![Coverage](https://gocover.io/_badge/github.com/rsjethani/secret)](https://gocover.io/github.com/rsjethani/secret) [![GoDoc reference example](https://img.shields.io/badge/godoc-reference-blue.svg)](https://pkg.go.dev/github.com/rsjethani/secret)
-# secret - Prevent your secrets from leaking into logs and std*
-The package provides the type `Secret` for storing passwords and credentials. Using this type allows the actual secret string to be automatically redacted from printing and marshaling processes. See Go docs for example usage.
+[![Coverage](https://gocover.io/_badge/github.com/rsjethani/secret)](https://gocover.io/github.com/rsjethani/secret) [![GoDoc reference example](https://img.shields.io/badge/godoc-reference-blue.svg)](https://pkg.go.dev/github.com/rsjethani/secret/v2)
+# secret v2
+
+### What secret is?
+- It provides simple Go types like [secret.Text](https://pkg.go.dev/github.com/rsjethani/secret/v2#Text) to encapsulate your secret.
+- The encapsulated secret remains inaccessible to operations like printing, logging, and JSON serializtion, a redact hint like `*****` is returned instead.
+- The only way to access the actual secret value is by asking explicitly via the `.Value()` method.
+
+### What secret is not?
+- It is not a secret management service or your local password manager.
+- It is not a Go client to facilitate communication with secret managers like Hashicorp Vault, AWS secret Manager etc. Checkout [teller](https://github.com/spectralops/teller) if that is what you are looking for.
+
+### Installation
+```
+go get github.com/rsjethani/secret/v2
+```
+NOTE: v1 is deprectated now.
+
+### Usage
+See godoc reference for usage examples.
+