Merge pull request #1 from dmdsousa/master

Section3

index.html

@@ -41,5 +41,17 @@ <h3 class="panel-title">Distributed revision control system.</h3>
 		<footer  class="navbar">
 			Developed in the class 'GIT system - fundamentals' during Software Engineering laboratory in <a href="http://www.iis.p.lodz.pl/">Institute of Applied Computer Science PŁ</a> 
 		</footer>
+		<section id="section3" class="panel panel-default">
+		<div class="panel-heading">
+    		<h3 class="panel-title">Centralized revision control system.</h3>
+  		</div>
+  		<div class="panel-body">
+	    	In  centralized revision control systems, there is one central repository, storing all units subjected to version control, and many clients who are connecting to it via the service access the various versions of the documents.
+	  	</div>
+		<footer class="panel-footer">
+			<a href="http://git-scm.com/book/en/Getting-Started-About-Version-Control#Centralized-Version-Control-Systems">Git - manual</a>
+		</footer>
+</section>
+
 	</body>
-</html>
+</html>