Initial what is wiki page

Preliminary content for what is wiki page, update home page

source/home.md

-
+---
+title: Getting Started
+author: David Lounsbury
+date: 2019-11-08
+affiliation: The Open Group
+copyright: ©2019, The Open Group
+---
 
 # Getting Started with The Open Group Community GitLab Wiki
 
@@ -6,20 +12,20 @@
 
 ### Wiki Basics
 
-What is a Wiki?
-What is Markdown syntax?
-Markdown editing tools 
-How to access the wiki on GitLab
-How to create and edit a document
-Reverting: How to revert your inevitable mistake
+* What is a Wiki?
+* What is Markdown syntax?
+* Some Markdown editing tools 
+* How to access the wiki on GitLab
+* How to create and edit a document
+* Reverting: How to revert your inevitable mistake
 
 ## Resources
 
-Where to find documentation and help
-Some best practices on content
+* Where to find documentation and help
+* Some best practices on content
 
 ## Master class
 
-AsciiDoc syntax
-Conversion of existing materials
-Diagramming in Wikis
+* AsciiDoc syntax
+* Conversion of existing materials
+* Diagramming in Wikis
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source/what_is_Wiki.md

+---
+title: What is a Wiki?
+author: David Lounsbury
+date: 2019-11-08
+affiliation: The Open Group
+copyright: ©2019, The Open Group
+---
+
+# What is a Wiki?
+
+
+## Wiki Overview
+
+From [Wikipedia](https://en.wikipedia.org/wiki/Wiki):
+
+>   A wiki is a knowledge base website on which users collaboratively modify content and structure directly from the web browser. In a typical wiki, text is written using a simplified markup language and often edited with the help of a rich-text editor
+
+The defining characteristics:
+
+* Collaborative editing of content
+     * Any user with access can create and edit content
+* Direct availability of edited content on the web
+
+Caveats:
+
+* Many types of wikis in the world
+* Different wiki implementations use different markup languages
+* Different wiki implementations have different editing interfaces
+
+## Wikis on Gitlab
+
+* GitLab provides a built-in Wiki for each project
+* GitLab wikis can use Markdown, AsciiDoc, or Rdoc markup language
+    * Either Markdown or AsciiDoc syntax are recommended
+* Gitlab can be edited either through the web interface of by editing and committing files
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