First draft.

README.md

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+[![License (3-Clause BSD)](https://img.shields.io/badge/license-BSD%203--Clause-blue.svg?style=flat-square)](http://opensource.org/licenses/BSD-3-Clause)  
+[![Known Vulnerabilities](https://snyk.io/test/github/ethauvin/bitly-shorten/badge.svg?targetFile=pom.xml)](https://snyk.io/test/github/ethauvin/bitly-shorten?targetFile=pom.xml) [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=ethauvin_bitly-shorten&metric=alert_status)](https://sonarcloud.io/dashboard?id=ethauvin_bitly-shorten) [![Build Status](https://travis-ci.org/ethauvin/bitly-shorten.svg?branch=master)](https://travis-ci.org/ethauvin/bitly-shorten) [![CircleCI](https://circleci.com/gh/ethauvin/bitly-shorten/tree/master.svg?style=shield)](https://circleci.com/gh/ethauvin/bitly-shorten/tree/master)
+
+# [Bitly](https://dev.bitly.com/v4/) Shortener for Kotlin/Java.
+
+A pretty simple and straightforward implementation of the link shortening ([bitlinks](https://dev.bitly.com/v4/#tag/Bitlinks)) abilities of the [Bitly v4 API](https://dev.bitly.com/v4).
+
+## Examples (TL;DR)
+
+```kotlin
+val bitly = Bitly(/* "YOUR_API_ACCESS_TOKEN from https://bitly.is/accesstoken" */)
+
+// Shorten
+bitly.bitlinks().shorten("https://erik.thauvin.net/blog")
+
+// Expand
+bitly.bitlinks().expand("http://bit.ly/380ojFd")
+
+// Clicks Summary
+bitly.bitlinks().clicks("http://bit.ly/380ojFd")
+```
+
+ - View [Kotlin](https://github.com/ethauvin/bitly-shorten/blob/master/examples/src/main/kotlin/com/example/BitlyExample.kt) or [Java](https://github.com/ethauvin/bitly-shorten/blob/master/examples/src/main/java/com/example/BitlySample.java) Examples.
+
+### API Access Token
+
+The Bitly API [Access Token](https://bitly.is/accesstoken) can be specified directly as well as via the `BITLY_API_TOKEN` environment variable or properties key.
+
+```kotlin
+// Env Variable or System Property
+vak bitly = Bitly()
+
+// Properties file path
+val bitly = Bitly(File("my.properties"))
+
+```
+```ini
+# my.properties
+BITLY_API_TOKEN=abc123def456ghi789jkl0
+```
+
+### JSON
+
+All implemented methods can return the full API JSON responses:
+
+```kotlin
+bitly.bitlinks().shorten("https://www.erik.thauvin.net/blog", toJson = true)
+```
+```json
+{
+    "created_at": "2020-02-26T06:50:08+0000",
+    "link": "http://bit.ly/380ojFd",
+    "id": "bit.ly/380ojFd",
+    "long_url": "https://erik.thauvin.net/blog"
+}
+```
+
+Non-implemented methods can also be called directly:
+
+```kotlin
+bitly.call("/user".toEndPoint(), method = Methods.GET)
+```
+```json
+{
+    "created": "2009-06-12T19:00:45+0000",
+    "modified": "2016-11-11T19:50:33+0000",
+    "login": "johndoe",
+    "is_active": true,
+    "is_2fa_enabled": true,
+    "name": "John Doe",
+    "emails": [
+        {
+            "email": "john@doe.com",
+            "is_primary": true,
+            "is_verified": true
+        }
+    ],
+    "is_sso_user": false,
+    "default_group_guid": "ABCde1f23gh"
+}
+```
+- View [Example](https://github.com/ethauvin/bitly-shorten/blob/master/examples/src/main/kotlin/com/example/BitlyRetrieve.kt)