docs: Add README

README.md

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+# Kinescope Player Iframe API Loader
+
+[![npm package](https://img.shields.io/npm/v/@kinescope/player-iframe-api-loader.svg?style=flat-square)](https://www.npmjs.org/package/@kinescope/player-iframe-api-loader)
+
+A simple loader of JavaScript files ([Iframe API](https://docs.kinescope.io/player/latest/)) and TypeScript types who uses Kinescope Player Iframe API.
+
+## Installation
+
+```shell
+npm install --save @kinescope/player-iframe-api-loader
+# or
+yarn add @kinescope/player-iframe-api-loader
+```
+
+## Features
+
+The loader replaces standard way of loading and using Iframe API such as `onKinescopeIframeAPIReady` callback.
+
+Also the library contains TypeScript type definitions. It is possible to use only TypeScript types without loader.
+
+Example:
+
+```ts
+import * as iframeApiLoader from '@kinescope/player-iframe-api-loader';
+
+// Load the latest stable version.
+const factory = await iframeApiLoader.load();
+// Create the player. Look at the docs, the link below.
+const player = await factory.create(...);
+
+```
+
+Using only types:
+
+```ts
+import '@kinescope/player-iframe-api-loader/types';
+
+const factory = window.Kinescope?.IframePlayer;
+if (factory) {
+  const player = await factory.create(...);
+}
+
+```
+
+> Player embedding docs: https://docs.kinescope.io/player/latest/iframe/IframePlayerFactory.html#create