Add contributing reference to user guide

user_guide_src/source/extending/contributing.rst

@@ -0,0 +1,71 @@
+###########################
+Contributing to CodeIgniter
+###########################
+
+CodeIgniter is a community driven project and accepts contributions of code
+and documentation from the community. These contributions are made in the form
+of Issues or `Pull Requests <https://help.github.com/articles/using-pull-requests/>`_
+on the `CodeIgniter4 repository <https://github.com/bcit-ci/CodeIgniter4>`_ on GitHub.
+
+Issues are a quick way to point out a bug. If you find a bug or documentation
+error in CodeIgniter then please check a few things first:
+
+- There is not already an open Issue
+- The issue has already been fixed (check the develop branch, or look for
+  closed Issues)
+- Is it something really obvious that you fix it yourself?
+
+Reporting issues is helpful but an even better approach is to send a Pull
+Request, which is done by "Forking" the main repository and committing to your
+own copy. This will require you to use the version control system called Git.
+
+Please see the `Contributing to CodeIgniter4 <https://github.com/bcit-ci/CodeIgniter4/tree/develop/contributing>`_ 
+section of our code repository.
+
+
+*******
+Support
+*******
+
+Please note that GitHub is not for general support questions! If you are
+having trouble using a feature of CodeIgniter, ask for help on our
+`forums <http://forum.codeigniter.com/>`_ instead.
+
+If you are not sure whether you are using something correctly or if you
+have found a bug, again - please ask on the forums first.
+
+********
+Security
+********
+
+Did you find a security issue in CodeIgniter?
+
+Please *don't* disclose it publicly, but e-mail us at [email protected],
+or report it via our page on `HackerOne <https://hackerone.com/codeigniter>`_.
+
+If you've found a critical vulnerability, we'd be happy to credit you in our
+`ChangeLog <https://bcit-ci.github.io/CodeIgniter4/changelog.html>`_.
+
+****************************
+Tips for a Good Issue Report
+****************************
+
+Use a descriptive subject line (eg parser library chokes on commas) rather than a vague one (eg. your code broke).
+
+Address a single issue in a report.
+
+Identify the CodeIgniter version (eg 4.0.1) and the component if you know it (eg. parser library)
+
+Explain what you expected to happen, and what did happen.
+Include error messages and stacktrace, if any.
+
+Include short code segments if they help to explain.
+Use a pastebin or dropbox facility to include longer segments of code or screenshots - do not include them in the issue report itself.
+This means setting a reasonable expiry for those, until the issue is resolved or closed.
+
+If you know how to fix the issue, you can do so in your own fork & branch, and submit a pull request.
+The issue report information above should be part of that.
+
+If your issue report can describe the steps to reproduce the problem, that is great.
+If you can include a unit test that reproduces the problem, that is even better, as it gives whoever is fixing
+it a clearer target!

user_guide_src/source/extending/index.rst

@@ -9,3 +9,4 @@ CodeIgniter 4 has been designed to be easy to extend or build upon.
 
     core_classes
     events
+    contributing

user_guide_src/source/installation/index.rst

@@ -4,6 +4,9 @@ Installation
 
 CodeIgniter4 can be installed manually, or using Composer.
 
+.. note:: Before using CodeIgniter, make sure that your server meets the
+          :doc:`requirements </intro/requirements>`.
+
 Manual Installation
 ===================
 

user_guide_src/source/intro/requirements.rst

@@ -2,7 +2,15 @@
 Server Requirements
 ###################
 
-`PHP <http://php.net/>`_ version 7.1 or newer is required, with the *intl* extension installed. `Why 7.1 <https://gophp71.org/>`_?
+`PHP <http://php.net/>`_ version 7.1 or newer is required, with the 
+`*intl* extension <http://php.net/manual/en/intl.requirements.php>`_ 
+installed. `Why 7.1 <https://gophp71.org/>`_?
+
+The following PHP extensions should be enabled on your server:
+``php-json``, ``php-mbstring``, ``php-mysqlnd``, `php-xml``
+
+In order to use the :doc:`CURLRequest </libraries/curlrequest>`, you will need 
+`libcurl <http://php.net/manual/en/curl.requirements.php>`_ installed.
 
 A database is required for most web application programming.
 Currently supported databases are: