Start writing doc about GitLab architecture for developers

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Start writing doc about GitLab architecture for developers
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Dmitriy Zaporozhets
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doc/development/architecture.md
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+# GitLab project architecture
+
+GitLab project consists of two parts: GitLab and GitLab shell.
+
+## GitLab
+
+Web application with background jobs workers. 
+Provides you with UI and most of functionality.
+For some operations like repo creation - uses GitLab shell.
+
+Uses: 
+ * Ruby as main language for application code and most libraries. 
+ * [Rails](http://rubyonrails.org/) web framework as main framework for application.
+ * Mysql or postgres as main databases. Used for persistent data storage(users, project, issues etc). 
+ * Redis database. Used for cache and exchange data between some components.
+ * Python2 because of [pygments](http://pygments.org/) as code syntax highlighter.
+
+## GitLab shell
+
+Command line ruby application. Used by GitLab through shell commands.
+It provides interface to all kind of manipulations with repositories and ssh keys.
+Full list of commands you can find in README of GitLab shell repo.
+Works on pure ruby and do not require any additional software.
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	1	+# GitLab project architecture
	2	+
	3	+GitLab project consists of two parts: GitLab and GitLab shell.
	4	+
	5	+## GitLab
	6	+
	7	+Web application with background jobs workers.
	8	+Provides you with UI and most of functionality.
	9	+For some operations like repo creation - uses GitLab shell.
	10	+
	11	+Uses:
	12	+ * Ruby as main language for application code and most libraries.
	13	+ * [Rails](http://rubyonrails.org/) web framework as main framework for application.
	14	+ * Mysql or postgres as main databases. Used for persistent data storage(users, project, issues etc).
	15	+ * Redis database. Used for cache and exchange data between some components.
	16	+ * Python2 because of [pygments](http://pygments.org/) as code syntax highlighter.
	17	+
	18	+## GitLab shell
	19	+
	20	+Command line ruby application. Used by GitLab through shell commands.
	21	+It provides interface to all kind of manipulations with repositories and ssh keys.
	22	+Full list of commands you can find in README of GitLab shell repo.
	23	+Works on pure ruby and do not require any additional software.
...	...