doc: create readme

README.md

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+### Dev-Client-Go
+========
+
+dev-api-go is a client library for the Forem (dev.to) [developer api](https://developers.forem.com/api) written in Go. It provides fully typed methods for every operation you can carry out with the current api (beta)(0.9.7)
+
+#### Installation
+> Go version >= 1.13
+```sh
+$ go get github.com/Mayowa-Ojo/dev-client-go
+```
+
+#### Usage
+Import the package and initialize a new client with your auth token(api-key).
+To get a token, see the authentication [docs](https://developers.forem.com/api#section/Authentication)
+```go
+package main
+
+import (
+   dev "github.com/Mayowa-Ojo/dev-client-go"
+)
+
+func main() {
+   client, err := dev.NewClient(<your api-key>)
+   if err != nil {
+      // handle err
+   }
+}
+```
+
+#### Documentation
+=========