Update README.md

README.md

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 ## Lessons
 
 1. [Intro](/INTRO.md)
+
+    1. What is SVG?
+    1. What Makes D3 So Special?
+    1. My Approach to Learning
+
 1. [SVG](/SVG.md)
+
+    1. Base tags
+    1. Basic Elements
+    1. Positioning
+    1. Styling
+    1. Important SVG elements
+
 1. [D3](/D3.md)
+
+    1. Basics
+    1. AJAX
+    1. Data Binding
+    1. Linear Scale
+    1. Time Scale
+    1. Axes
+    1. Events
+    1. Behaviors
+
 1. [Scatter Plot](/SCATTER_PLOT.md)
+
+    1. Add link to d3 library
+    1. Add an <svg> tag and size it with D3
+    1. Create some fake data for our app
+    1. Add SVG circles and style them
+    1. Create a linear scale
+    1. Attach data to visual elements
+    1. Use data attached to a visual element to affect its appearance
+    1. Create a time scale
+    1. Parse and format times
+    1. Set dynamic domains
+    1. Dynamically generate svg elements
+    1. Create axes
+    1. Display data in a table
+    1. Create click handler
+    1. Remove data
+    1. Drag an element
+    1. Update data after a drag
+    1. Create a zoom behavior that scales elements
+    1. Update axes when zooming
+    1. Update click points after a transform
+    1. Avoid redrawing entire screen during render
+    1. Hide elements beyond axis
+    1. Use AJAX
+    
 1. [Bar Graph](/BAR.md)
+
+    1. Use AJAX to make an asynchronous call to an external data file
+    1. Create a Bar graph
+
 1. [Pie Chart](/PIE.md)
+
+    1. Create an ordinal scale
+    1. Create a color scale
+    1. Add paths for each pie segment
+    1. Generate an arc creating function
+    1. Format the data for the arc
+    1. Adjust the position of the pie
+    1. Make a donut graph
+    1. Remove parts of the pie
+
 1. [Force Directed Graphs](/FORCE_DIRECTED_GRAPH.md)
+
+    1. Creating a physics based force that will center nodes
+    1. Creating a physics based force that make the nodes repel each other
+    1. Creating a physics based force that will link the nodes to show their relationship
+
 1. [Mapping](/MAPS.md)
 
+    1. Creating a map
+    1. Define GeoJSON
+    1. Use a projection
+    1. Generate a <path> using a projection and the GeoJSON data
+
 ## Labs
 
 1. [Lab](/Lab.md)