Add most commonly used Doxygen comment snippets

snippets/c.lua

@@ -45,6 +45,16 @@ local snippets = {
     end, key('guard')),
   }, {}),
 
+  -- Doxygen
+  snippet('p', {
+    text('@param'),
+    choice(1, { text('[in]'), text('[out]'), text('[in,out]'), text('') }),
+    text(' '),
+    insert(2, 'name'),
+    text(' '),
+    insert(0, 'desc'),
+  }),
+
 }
 
 return snippets

snippets/c.snippets

@@ -4,3 +4,13 @@ snippet main
 	int main(${1:int argc, const char **argv}) {
 		$0
 	}
+
+# Doxygen
+snippet b
+	@brief ${0:desc}
+
+snippet r
+	@return ${0:desc}
+
+snippet rv
+	@retval ${1:val} ${0:desc}