Add LaTeX script and sample code

examples/hello-4.c

@@ -0,0 +1,25 @@
+/*
+ *  hello-4.c - Demonstrates module documentation.
+ */
+#include <linux/module.h>       /* Needed by all modules */
+#include <linux/kernel.h>       /* Needed for KERN_INFO */
+#include <linux/init.h>         /* Needed for the macros */
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bob Mottram");
+MODULE_DESCRIPTION("A sample driver");
+MODULE_SUPPORTED_DEVICE("testdevice");
+
+static int __init init_hello_4(void)
+{
+    pr_info("Hello, world 4\n");
+    return 0;
+}
+
+static void __exit cleanup_hello_4(void)
+{
+    pr_info("Goodbye, world 4\n");
+}
+
+module_init(init_hello_4);
+module_exit(cleanup_hello_4);