Add “Learn More” section to Litmus Introduction doc (#382)

Signed-off-by: Lutfi Hakim <lutfihakim1606@gmail.com>

Author: hakimlutfi46

website/docs/introduction/what-is-litmus.md

@@ -30,4 +30,8 @@ Chaos Experiments are fundamental units within the LitmusChaos architecture. Use
 
 A chaos scenario is much more than a simple chaos experiment. It supports the user in defining the expected result, observing the result, analysing the overall system behaviour, and in the decision-making process if the system needs to be tuned for improving the resilience.
 
-
+## Learn More
+* [Install Litmus](../../docs/getting-started/installation.md)
+* [Usecases of Litmus](../../docs/introduction/usage.md)
+* [Core Principles](../../docs/introduction/core-principles.md)
+* [Join our Community](../../docs/introduction/community.md)