Clean up docs and add example projects (#42)

* Updating docs to exclude tests from the scripting docs and adding TableOfContents.md. The table of contents does not properly show up on the index.md.

* Adding example project listing to index.md

com.unity.perception/Documentation~/index.md

 
 [Setting up your first perception scene](GettingStarted.md)
 
+## Example projects using Perception
+
+### SynthDet
+
+<img src="images/synthdet.png"/>
+
+[SynthDet](https://github.com/Unity-Technologies/SynthDet) is an end-to-end solution for training a 2d object detection model using synthetic data.
+
+### Unity Simulation Smart Camera Example
+<img src="images/smartcamera.png"/>
+
+The [Unity Simulation Smart Camera Example](https://github.com/Unity-Technologies/Unity-Simulation-Smart-Camera-Outdoor) illustrates how Perception could be used in a smart city or autonomous vehicle simulation. Datasets can be generated locally or at scale in [Unity Simulation](https://unity.com/products/unity-simulation).
+
 ## Package contents
 
 |Feature|Description

com.unity.perception/Tests/Editor/DatasetCaptureEditorTests.cs

 using NUnit.Framework;
 using UnityEngine.Perception.GroundTruth;
 
-namespace GroundTruth
+namespace GroundTruthTests
 {
     public class DatasetCaptureEditorTests
     {

com.unity.perception/Documentation~/TableOfContents.md

+* [Installation Instructions](SetupSteps.md)
+* [Getting Started](GettingStarted.md)
+* [Labeling](GroundTruth-Labeling.md)
+* [Perception Camera](PerceptionCamera.md)
+* [Dataset Capture](DatasetCapture.md)

com.unity.perception/Documentation~/filter.yml

+apiRules:
+  - exclude:
+      uidRegex: Tests$
+      type: Namespace
+  - exclude:
+      uidRegex: Tests
+      type: Type