Added examples

FossilOrigin-Name: affc62bafc288eb7ab174a463aba77cc0afe6b9b75ab59d92b945245c38392dd

src/cw/doxyfilter

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+cat $1 | sed 's/@endcomment/*\//g' | sed 's/@startcomment/\/*/g' 
+
+

src/cw/examples/mavl_add_example.c

@@ -0,0 +1,27 @@
+#include <errno.h>
+#include <stdio.h>
+#include "cw/mavl.h"
+...
+
+mavldata_t * result, data;
+mavl_t tree;
+
+/* create a mavl tree to store integers */
+
+tree = mavl_create(mavl_cmp_dword, NULL);
+  
+... do some other stuff 
+
+/*  add the value 17 to the tree */
+data.dword = 17;
+result = mavl_add(tree,&data);
+
+if (result == NULL )
+        printf("Error: %s", strerror(errno));
+if (result == &data)
+        printf("Element already exists\n");
+else
+        printf("Element successful addded");
+
+}
+