Update documentation, change CONFIG_EXAMPLES_NSH to CONFIG_NSH

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3394 42af7a65-404d-4744-a932-0658087f49c3

netutils/README.txt

@@ -0,0 +1,39 @@
+netutils
+^^^^^^^^
+
+This directory contains most of the network applications contained
+under the uIP-1.0 apps directory.  As the uIP apps/README says,
+these applications "are not all heavily tested."  These uIP apps
+include:
+
+  dhcpc     - Dynamic Host Configuration Protocol (DHCP) client
+  resolv    - uIP DNS resolver
+  smtp      - Simple Mail Transfer Protocol (SMTP) client
+  telnetd   - TELNET server
+  webclient - HTTP web client
+  webserver - HTTP web server
+
+You may find additional information on these apps in the uIP forum
+accessible through: http://www.sics.se/~adam/uip/index.php/Main_Page 
+
+Additional applications that were not part of uIP (but which are
+highly influenced by uIP) include:
+
+  dhcpd     - Dynamic Host Configuration Protocol (DHCP) server
+  tftpc     - TFTP client
+  thttpd    - This is a port of Jef Poskanzer's THTTPD HTPPD server.
+              See http://acme.com/software/thttpd/.
+
+If you use DHCPC/D, then some special configuration network options are
+required.  These include:
+
+  CONFIG_NET=y               Of course
+  CONFIG_NSOCKET_DESCRIPTORS And, of course, you must allocate some
+                             socket descriptors.
+  CONFIG_NET_UDP=y           UDP support is required for DHCP
+                             (as well as various other UDP-related
+                             configuration settings).
+  CONFIG_NET_BROADCAST=y     UDP broadcast support is needed.
+  CONFIG_NET_BUFSIZE=650     The client must be prepared to receive
+  (or larger)                DHCP messages of up to 576 bytes (excluding
+                             Ethernet, IP, or UDP headers and FCS).