Document the Geeqie coding style.

This is a draft, please improve.

diff --git a/CODING b/CODING
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+Please keep the general coding style of Geeqie:
+
+Space after if, while and for:
+
+while (...)
+for (...)
+if (...)
+
+Indentation of {}:
+
+while (...)
+       {
+       ...
+       }
+
+if (...)
+       {
+       ...
+       }
+else
+       {
+       ...
+       }
+
+Spaces around operators:
+
+i = 2;
+
+Space after comma:
+func(a, b, c);
+
+Use glib functions when possible (ie. g_ascii_isspace() instead of isspace()).
+Please use glib types when possible (ie. gint and gchar instead of int and char)
+.
+
+Check twice the indentation and spurious whitespaces.
+