Update README.md

Author: MelissaGraham

README.md

@@ -14,6 +14,9 @@ These notebooks have drawn from these repositories:
 | 03. Image Display and Manipulation | Display and manipulate DC2 images, explore image mask planes, create cutout and RGB images. |
 | 04. Intro to Butler | Discover, query, retrieve, and display DC2 images and catalog data with the Generation 3 Butler. |
 | 05. Intro to Source Detection | Learn to use the LSST Science Pipelines tasks for image characterization, source detection, deblending, and measurement. Learn to interact with a source footprint. |
+| 06. Comparing Object and Truth Table | TBD |
+| 07. *(time-domain tutorial)* | TBD |
+| 08. *(data visualization)* | TBD |
 
 Potential notebooks in development: