Añade el plugin Redmine Git Server 0.4

plugins/redmine_git_server/README.md

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+Redmine plugin - Git Server
+============
+
+This Redmine plugin lets your users pull and push to/from your git repositories hosted on Redmine with HTTP - without any complex setup.
+
+Under the hood, it relies on [Grack](https://github.com/grackorg/grack), a Ruby/Rack Git Smart HTTP Server Handler.
+
+
+Screenshot
+------------
+
+![redmine_git_server example](assets/images/screenshot.png)
+
+
+Installation
+------------
+
+This plugin is tested with Redmine 4.1+ (but it could be compatible with other versions).
+
+Please apply general instructions for plugins [here](http://www.redmine.org/wiki/redmine/Plugins).
+
+Note that this plugin depends on this other plugin:
+* **redmine_base_deface** [here](https://github.com/jbbarth/redmine_base_deface)
+
+First download the source or clone the plugin and put it in the "plugins/" directory of your redmine instance. Note that this is crucial that the directory is named 'redmine_git_server'!
+
+Then execute:
+
+    $ bundle install
+    $ rake redmine:plugins
+
+And finally restart your Redmine instance.
+
+
+Permissions
+-----------
+
+* *Git Server > Enable git server* : allows a user to enable/disable the project module "Git Server"
+* *(Redmine built-in) Repository > View changesets* : allows a user to fetch changesets (pull) from a repository
+* *(Redmine built-in) Repository > Commit access* : allows a user to push to a repository
+
+
+Alternatives
+------------
+
+* [redmine_git_hosting](http://redmine-git-hosting.io/) - based on Gitolite, this plugin offer a **lot** more features but it is also more complex to setup.
+
+
+Knowns issues
+-------------
+
+Puma 3.7 which is currently bundled with Redmine has an issue with chunked uploads. You can upgrade to Puma 4.3 or configure git locally to avoid chunked uploads (eg. `git config --global http.postBuffer 524288000`)