updates the secon lecture slides

lectures/revealjs/02-git-plus-plus.adoc

-= Title here
+= Git++
 :customcss: slides.css
 :icons: font
 :includedir: revealjs/includes/
@@ -56,6 +56,12 @@ IT1901 Fall 2021 - {LECTURE_NO}
 [color = "#fff6d5"]
 == Git
 
+== What is git
+
+Git is a source code management system that is lightweight, reliable, fast and fully distributed. 
+On top of that it is free and open source. Git was  initially authored by Linus Torwalds and emerged from his troubles encountered while trying to manage the contributions to Linux kernel.
+
+
 include::{includedir}scm_content.adoc[]
 
 
@@ -63,8 +69,10 @@ include::{includedir}scm_content.adoc[]
 [color = "#fff6d5"]
 == Gitlab
 
-== Gitlab
 
+== What is GitLab
+
+Is a complete devops solution that does reposiitory hosting, issue tracking, agile planning, code review, ci/cd and more. It started as an open source project and it still has a community edition which is free and open source