Add an LO on code reviews

[damithc]

Possible content:

Here are some things you can comment on when reviewing code:

* Read the code from the perspective of a new developer. Identify parts that are harder to understand and suggest improvements.
* Point out any coding standard violations.
* Suggest better names for methods/variables/classes.
* Point out unnecessary code duplications.
* Check if the comments, docs, tests have been updated to match the code change.
* Check for violation of relevant principles such as the SOLID principles.
* Point out where SLAP can be improved. e.g. methods that are too long or has too deep nesting.
* Suggest any other code quality improvements.

*Resources*

* https://www.kevinlondon.com/2015/05/05/code-review-best-practices.html[Code Review Best Practices] - Blog post by Kevin London
* https://www.atlassian.com/agile/code-reviews[Why Code Reviews Matter] - An article by Atlassian