Add readme

Author: serejahh

README.md

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+# DBClient
+
+## Requirements
+
+- Xcode 8
+- Swift 3
+- iOS 9+
+
+## Installation
+
+### Cocoapods
+
+There're 3 podspecs:
+
+Core, common classes for any database:
+
+```ruby
+pod 'DBClient', '~> 1.0'
+```
+
+Wrapper for CoreData:
+
+```ruby
+pod 'DBClient/CoreData', '~> 1.0'
+```
+
+Wrapper for Realm:
+
+```ruby
+pod 'DBClient/Realm', '~> 1.0'
+```
+⚠️ It's not ready yet (there're problems with deletion and observation)