[Documentation] Add initial arch. docs

Add initial architecture docs; remove docs folder
from gitignore, as the generated docs (which should
be ignored) have been moved to target/docs.
MissionControl/vista#21.

.gitignore

@@ -20,9 +20,6 @@ closed-lib
 # Node dependencies
 node_modules
 
-# Build documentation
-docs
-
 # Protractor logs
 protractor/logs
 

docs/src/architecture/Framework.md

@@ -0,0 +1,73 @@
+#Overview
+
+The framework layer's most basic responsibility is allowing individual
+software components to communicate. The software components it recognizes
+are:
+
+* _Extensions_: Individual units of functionality that can be added to
+  or removed from Open MCT Web. _Extension categories_ distinguish what
+  type of functionality is being added/removed.
+* _Bundles_: A grouping of related extensions
+  (named after an analogous concept from [OSGi](http://www.osgi.org/))
+  that may be added or removed as a group.
+
+The framework layer operates by taking a set of active bundles, and
+exposing extensions to one another as-needed, using
+[dependency injection](https://en.wikipedia.org/wiki/Dependency_injection).
+Extensions are responsible for declaring their dependencies in a
+manner which the framework layer can understand.
+
+```nomnoml
+#direction: down
+[Open MCT Web|
+  [Dependency injection framework]-->[Platform bundle #1]
+  [Dependency injection framework]-->[Platform bundle #2]
+  [Dependency injection framework]-->[Plugin bundle #1]
+  [Dependency injection framework]-->[Plugin bundle #2]
+  [Platform bundle #1|[Extensions]]
+  [Platform bundle #2|[Extensions]]
+  [Plugin bundle #1|[Extensions]]
+  [Plugin bundle #2|[Extensions]]
+  [Platform bundle #1]<->[Platform bundle #2]
+  [Plugin bundle #1]<->[Platform bundle #2]
+  [Plugin bundle #1]<->[Plugin bundle #2]
+]
+```
+
+The "dependency injection framework" in this case is
+[AngularJS](https://angularjs.org/). Open MCT Web's framework layer
+is really just a thin wrapper over Angular that recognizes the
+concepts of bundles and extensions (as declared in JSON files) and
+registering extensions with Angular. It additionally acts as a
+mediator between Angular and [RequireJS](http://requirejs.org/),
+which is used to load JavaScript sources which implement
+extensions.
+
+```nomnoml
+[Framework layer|
+  [AngularJS]<-[Framework Component]
+  [RequireJS]<-[Framework Component]
+  [Framework Component]1o-*[Bundles]
+]
+```
+
+It is worth noting that _no other components_ are "aware" of the
+framework component directly; Angular and Require are _used by_ the
+framework components, and extensions in various bundles will have
+their dependencies satisfied by Angular as a consequence of registration
+activities which were performed by the framework component.
+
+
+## Application Initialization
+
+The framework component initializes an Open MCT Web application following
+a simple sequence of steps.
+
+```nomnoml
+[<start> Start]->[<state> Load bundles.json]
+[Load bundles.json]->[<state> Load bundle.json files]
+[Load bundle.json files]->[<state> Resolve implementations]
+[Resolve implementations]->[<state> Register with Angular]
+[Register with Angular]->[<state> Bootstrap application]
+[Bootstrap application]->[<end> End]
+```