Placeholders for new Swift docs

Documentation/BasicOperators.md

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+# Basic Operators
+
+This document explains some of the most common operators used in ReactiveCocoa,
+and includes examples demonstrating their use.
+

Documentation/DesignGuidelines.md

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+# Design Guidelines
+
+This document contains guidelines for projects that want to make use of
+ReactiveCocoa. The content here is heavily inspired by the [Rx Design
+Guidelines](http://blogs.msdn.com/b/rxteam/archive/2010/10/28/rx-design-guidelines.aspx).
+
+This document assumes basic familiarity
+with the features of ReactiveCocoa. The [Framework Overview][] is a better
+resource for getting up to speed on the functionality provided by RAC.
+

Documentation/MemoryManagement.md

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+# Memory Management
+

Documentation/ObjectiveCBridging.md

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+# Objective-C Bridging
+