message: Adds link to design rationales into repo README
diff: @@ -53,3 +53,4 @@ The physical design encompasses everything that is not software run on the devic
  * [Manufacturing Design](4_Manufacturing_Design)
  * [Alpha Build Instructions](4_Manufacturing_Design/Alpha_Build_Instructions) -
  documentation for building the "Alpha" version of the device which can be used by developers to contribute to the software. Note that this is almost always out of date, by definition.
  + * [Design Rationale](DesignRationales.md) - An explanation of the rationale that went into specific parts can be found here.
  