added README

Author: Firdavs Khaydarov

README.md

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+# LinearProgressBar
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-brightgreen.svg?style=flat)](https://github.com/Carthage/Carthage)
+
+Material Linear Progress Bar for your iOS apps
+
+![Demo](https://downloader.disk.yandex.ru/disk/21ca24d13b128e9fd50e5899bec02d10ff53fc85d66ee7907dcd999eb42b82da/5aabf9cf/hDHGBVuXuRvYbyanDrrZELlrKlQO78nOrwEB3wkqgjXnD_gjkv7ZMrNpC8ZFM9lEHQyjaz1_Izngg4uj8uuVpA%3D%3D?uid=0&filename=LinearProgressBarAnimation.gif&disposition=inline&hash=&limit=0&content_type=image%2Fgif&fsize=45771&hid=78b85475af9f1b66a5cce590a72726ae&media_type=image&tknv=v2&etag=19d044a999520e0dd7e13ca9c3d20a7a)
+
+## Installation
+### Carthage:
+```
+github "Recouse/LinearProgressBar"
+```
+
+## Requirements
+- iOS 8.0+
+- Xcode 9.0+
+- Swift 3.2+
+
+## Usage
+```swift
+import LinearProgressBar
+
+let progressBar = LinearProgressBar()
+...
+view.addSubview(progressBar)
+progressBar.startAnimating()
+```
+
+You can use it like activity indicator in `UIViewController`:
+```swift
+// Start animating
+showProgressBar()
+
+// Stop animating
+hideProgressBar()
+```
+
+## Contribution
+Feel free to make pull requests