Add simple module as an example of driver for ksudoku subsystem

Makefile

@@ -1,4 +1,6 @@
 obj-m = ksudoku.o
+obj-m += simple.o
+
 kernel_version = $(shell uname -r)
 build_dir = /lib/modules/$(kernel_version)/build
 

simple.c

@@ -0,0 +1,55 @@
+/*
+ * A simple algorithm to solve sudoku for ksudoku subsystem
+ * Copyright (C) 2020 Sameer Rahmani <lxsameer@gnu.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+#include "ksudoku.h"
+
+#define SIMPLE_SUDOKU_VERSION "0.1"
+#define SIMPLE_SUDOKU_DESC "A simple sudoku algorithm"
+
+
+static struct ksudoku *sudoku;
+
+static int simple_sudoku_init(void)
+{
+
+        printk(KERN_ALERT "Simple sudoku init.\n");
+
+        sudoku = ksudoku_create_sudoku("simple");
+
+        if (!sudoku)
+                return -ENOMEM;
+
+        return 0;
+}
+
+
+static void simple_sudoku_exit(void)
+{
+        ksudoku_destroy_ksudoku(sudoku);
+        printk(KERN_ALERT "Exit simple sudoku.\n");
+}
+
+
+MODULE_AUTHOR("Sameer Rahmani <lxsameer@gnu.org>");
+
+MODULE_DESCRIPTION(SIMPLE_SUDOKU_DESC);
+MODULE_VERSION(SIMPLE_SUDOKU_VERSION);
+MODULE_LICENSE("GPL");
+
+module_init(simple_sudoku_init);
+module_exit(simple_sudoku_exit);