Create Installation.md

Docs/Installation.md

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+# Installation
+
+Pulse is distributed as a binary framework using [Swift Package Manager](https://swift.org/package-manager/).
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+If you are using Xcode 11 or higher, go to **File / Swift Packages / Add Package Dependency...** and enter package repository URL **https://github.com/kean/PulseUI** (requires access), then follow the instructions.
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+To remove the dependency, select the project and open **Swift Packages** (which is next to **Build Settings**). You can add and remove packages from this tab.
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+> Swift Package Manager can also be used [from the command line](https://swift.org/package-manager/).
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+After adding a package, make sure to add all suggested products to your project.
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+<img src="https://user-images.githubusercontent.com/1567433/107453875-d3668d80-6b19-11eb-804d-b29059275deb.png">
+