Created Installation (markdown)

Installation.md

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+- Requires:
+    - iOS 8 SDK and above
+    - Swift 1.2
+- Dependencies:
+    - [GCDKit](https://github.com/JohnEstropia/GCDKit)
+
+### Install with Cocoapods
+```
+pod 'CoreStore'
+```
+This installs CoreStore as a framework. Declare `import CoreStore` in your swift file to use the library.
+
+### Install with Carthage
+```
+github "JohnEstropia/CoreStore" >= 0.2.0
+```
+
+### Install as Git Submodule
+```
+git submodule add https://github.com/JohnEstropia/CoreStore.git <destination directory>
+```
+Drag and drop **CoreStore.xcodeproj** to your project.
+
+#### To install as a framework:
+Drag and drop **CoreStore.xcodeproj** to your project.
+
+#### To include directly in your app module:
+Add all *.swift* files to your project.
+
+
+## Contents
+- [[Architecture]]
+- [[Setting up]]
+- [[Saving and processing transactions]]
+- [[Fetching and querying]]
+- [[Logging and error handling]]
+- [[Observing changes and notifications]]