[DOC][DUMPCHECK] Add document.

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+DUMP LIST CHECKER (and EXTRACTOR)
+=================================
+
+        Oct 15, 2019 Kyuma Ohta <whatisthis.sowhat _at_ gmail.com>
+          
+## About:
+
+ This is checking and decoding "Dump list" of 80's (or earlier) computer magazines.
+ 
+ Now, don't generate binary data from dump list, cheking only yet.
+
+## Building:
+
+    cc -o dumpcheck dumplist.c
+       
+## Synopsis:
+
+    ./dumpcheck -i input_file [--checkonly]
+       
+*  "input file" is plain text (see format).
+*  --checkonly : Don't generate binary file
+
+## Dumplist format:
+
+ This should plain text with below format:
+
+> [ADDR+0x00] xx yy (repeat 16 times) :[XSUM0]
+> [ADDR+0x10] (Same format)
+>            (repeat 16 times)
+> [ADDR+0xf0] ...                     :[XSUMF]
+> Sum:        [YSUM0] ... [YSUMF]    :[TOTAL SUM]
+ 
+ ADDR is hexadecimal, not decimal.
+
+>      [XSUMn] = ([Value of +0xn0] + [Value of +0xn1] +...+ [Value 0f +0xnF]) & 0xFF .
+>      [YSUMm] = ([Value of +0x0m] + [Value of +0x1m] +...+ [Value of +0xFm]) & 0xFF .
+>  [TOTAL SUM] = ([VAlue of +0x00] + [Value of +0x01] +...+ [Value of +0xFF]) & 0xFF.
+  
+ for example:
+> 1000 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F :78 
+> 1010 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F :78 
+> ...
+> 10F0 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F :78 
+> Sum: 00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0 :80
+
+### Have fun!!
+Ohta.