added markdown sample file
-rw-r--r-- 433 Makefile
-rw-r--r-- 1221 cstring.c
drwxr-xr-x - include
-rw-r--r-- 588 markdown.c
-rw-r--r-- 2845 markdown_io.c
-rw-r--r-- 356 sample.md
drwxr-xr-x - test
-rw-r--r-- 912 tmp.c