Add a terminology guide

tutorial/index.rst

@@ -7,7 +7,7 @@ JupyterLab Tutorial
 ===================
 
 .. important::
-    
+
     This is a very early pre-alpha developer preview and not suitable for
     general usage yet. Features and implementation are subject to change.
 
@@ -24,6 +24,7 @@ Contents:
    notebook.md
    patterns.md
    examples.md
+   terminology.md
 
 Indices and tables
 ==================

tutorial/terminology.md

@@ -0,0 +1,16 @@
+# Terminology
+
+Learning to use a new technology and its architecture can be complicated by
+the jargon used to describe components. We provide this terminology guide
+to help smooth the learning the components.
+
+## Terms
+
+- Application
+- Extension
+- Phosphide
+- Phosphor
+- Provider: see Service Provider
+- Service Provider
+- Standalone example
+- TypeScript