Updated README

fs/procfs/README.txt

-fs/procfs README
-================
-
-  This is a tiny procfs file system that allows read-only access to a few
-  attributes of a task or thread.  This tiny procfs fs file system can be
-  built into the system by enabling:
-
-    CONFIG_FS_PROCFS=y
-
-  It can then be mounted from the NSH command like like:
-
-    nsh> mount -t procfs /proc
+fs/procfs README
+================
+
+  This is a tiny procfs file system that allows read-only access to a few
+  attributes of a task or thread.  This tiny procfs fs file system can be
+  built into the system by enabling:
+
+    CONFIG_FS_PROCFS=y
+
+  It can then be mounted from the NSH command like like:
+
+    nsh> mount -t procfs /proc
+
+Example
+=======
+
+  NuttShell (NSH) NuttX-6.31
+  nsh> mount -t procfs /proc
+
+  nsh> ls /proc
+  /proc:
+   0/
+   1/
+
+  nsh> ls /proc/1
+  /proc/1:
+   status
+   cmdline
+
+  nsh> cat /proc/1/status
+  Name:       init
+  Type:       Task
+  State:      Running
+  Priority:   100
+  Scheduler:  SCHED_FIFO
+  SigMask:    00000000
+
+  nsh> cat /proc/1/cmdline
+  init
+
+  nsh> sleep 100 &
+  sleep [2:100]
+  nsh> ls /proc
+  ls /proc
+  /proc:
+   0/
+   1/
+   2/
+  nsh> cat /proc/2/cmdline
+  <pthread> 0x527420