Attempt at defining some naming conventions.

doc/source/guidelines.rst

@@ -63,8 +63,7 @@ Issue tracking
 ==============
 
 Issue tracking is done using `GitLab <https://about.gitlab.com/>`_ at http://git.metabarcoding.org/.
-Creating a branch should always lead to the creation of a label that refers to it in GitLab.
+Tickets should always be labeled with the branches for which they are relevant.
-Tickets should always be labelled with the branches for which they are relevant.
 
 
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@@ -99,8 +98,20 @@ in the Sphinx documentation using `Breathe <https://breathe.readthedocs.org/en/l
 Naming conventions
 ******************
 
-.. todo::
+Struct, Enum:                                   ``Title_case``
-	Look for common naming conventions
+
+Enum members, macros, constants:                ``ALL_CAPS``
+
+Functions, local variables:                     ``lower_case``
+
+Functions that shouldn't be called directly:    ``_lower_case`` (``_`` prefix)
+
+Global variables:                                ``g_lower_case`` (``g_`` prefix)
+
+Pointers:                                        ``pointer_ptr`` (``_ptr`` suffix)
+
+.. note::
+    Underscores are used to delimit words.
 
 
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