Added skeleton Doc files for the whole developer's documentation.

lib/Doc

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+H Library
+.F csum Checksums and hash functions
+..S checksum.c md5.c
+.F ip IP addresses
+..S ip.c ipv4.c ipv6.c
+.F list Linked lists
+..S lists.c
+.H Resource management
+..F gen Generic resource functions
+...S resource.c
+..F mempool Memory pools
+...S mempool.c
+..F slab Slabs
+...S slab.c
+..F sock Sockets
+...S socket.h
+.H Miscellaneous functions
+..F bit Bit operations
+...S bitops.c
+..F event Events
+...S event.c
+..F pat Pattern matching
+...S patmatch.c
+..F printf Printf
+...S printf.c
+..F unaligned Unaligned access