Add procfs and kernel topic page

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+title:Create threads
+keywords:kernel,linux,threads
+
+# Create threads
+
+State of kernel thread  - include/linux/sched.h
+
+```c
+/* Used in tsk->state: */
+#define TASK_RUNNING			0x00000000
+#define TASK_INTERRUPTIBLE		0x00000001
+#define TASK_UNINTERRUPTIBLE		0x00000002
+#define __TASK_STOPPED			0x00000004
+#define __TASK_TRACED			0x00000008
+/* Used in tsk->exit_state: */
+#define EXIT_DEAD			0x00000010
+#define EXIT_ZOMBIE			0x00000020
+#define EXIT_TRACE			(EXIT_ZOMBIE | EXIT_DEAD)
+/* Used in tsk->state again: */
+#define TASK_PARKED			0x00000040
+#define TASK_DEAD			0x00000080
+#define TASK_WAKEKILL			0x00000100
+#define TASK_WAKING			0x00000200
+#define TASK_NOLOAD			0x00000400
+#define TASK_NEW			0x00000800
+#define TASK_RTLOCK_WAIT		0x00001000
+#define TASK_FREEZABLE			0x00002000
+#define __TASK_FREEZABLE_UNSAFE	       (0x00004000 * IS_ENABLED(CONFIG_LOCKDEP))
+#define TASK_FROZEN			0x00008000
+#define TASK_STATE_MAX			0x00010000
+
+#define TASK_ANY			(TASK_STATE_MAX-1)
+```
+
+## Links
+
+
+https://www.linuxtoday.com/blog/kernel-threads/  
+http://www.embeddedlinux.org.cn/EssentialLinuxDeviceDrivers/final/ch03lev1sec1.html  
+https://elixir.bootlin.com/linux/v6.1.21/source/include/linux/sched.h  
+https://elixir.bootlin.com/linux/v6.1.21/source/kernel/sysctl.c  
+
+
+
+