Introduce new [Spotify] command – Search Tracks (#486)

* Spotify: Introduce Search Tracks command

* Update README.md

* Update README.md

Author: mattisssa

extensions/spotify-player/.eslintrc.json

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+{
+  "root": true,
+  "env": {
+    "es2020": true,
+    "node": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended", "prettier"]
+}

extensions/spotify-player/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/spotify-player/README.md

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+<p align="center">
+   <img src="assets/icon.png" height="128">
+   <h1 align="center">Spotify</h1>
+ </p>
+
+ A [Raycast](https://raycast.com/) extension that lets you easily control [Spotify](https://spotify.com).
+
+ ![Example of Spotify Extension on Raycast](https://user-images.githubusercontent.com/15333662/144867047-d047c089-104d-4709-b28d-1d369a2dab8c.mp4)
+
+### Configure `Client ID` and `Secret`
+
+Please provide **Client ID** and **Secret** in the extension preferences (Preferences -> Extensions -> Search Tracks).\
+To create a new client id and secret, do the following:
+
+1. Go to the [Dashboard](https://developer.spotify.com/dashboard) page at the Spotify Developer website and, if necessary, log in.
+2. Accept the latest [Developer Terms of Service](https://developer.spotify.com/terms/) to complete your account setup.
+3. Create a new Spotify app at [Applications](https://developer.spotify.com/dashboard/applications)
+4. Copy **Client ID** and **Client Secret** into the extension preferences
+
+![](https://cln.sh/8rCev4/download)
+
+---
+
+#### Has we forgotten something? Let us know and [create an issue](https://github.com/raycast/extensions/issues/new/choose)!