Initial pass on the design documentation.

The design doc and software design doc.
The UML images are generated with plantUML from the *.puml files.

docs/uml/switcher.puml

@@ -0,0 +1,35 @@
+@startuml
+interface App
+
+[Switcher] --> [AppID]
+[Switcher] --> [App] : use
+
+package "Menu" {
+   [App] <-- [Menu]
+}
+
+package "Badge" {
+   [App] <-- [Badge]
+}
+
+package "Snake" {
+   [App] <-- [Game]
+}
+
+package "NFC" {
+   [App] <-- [NFC]
+}
+
+
+package "Channel" {
+   [ButtonReceiver] <-u- [Menu] : use
+   [ButtonReceiver] <-u- [Badge] : use
+   [ButtonReceiver] <-u- [Game] : use
+   [ButtonReceiver] <-u- [NFC] : use
+   [FrameSender] <-u- [Menu] : use
+   [FrameSender] <-u- [Badge] : use
+   [FrameSender] <-u- [Game] : use
+   [FrameSender] <-u- [NFC] : use
+}
+
+@enduml

docs/uml/tasks.puml

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+@startuml
+skinparam componentStyle rectangle
+[Tasks] --> [Switcher]
+[Tasks] --> [Display]
+
+package "Button Listeners" {
+   [Tasks] --> [A Button Listener]
+   [Tasks] --> [B Button Listener]
+   [Tasks] --> [Start Button Listener]
+}
+
+@enduml
+