add git ignore file
-rw-r--r-- 7 .gitignore
-rwxr-xr-x 573 Makefile
-rwxr-xr-x 647 Makefile2
-rwxr-xr-x 654 Makefile3
drwxr-xr-x - coriolis2
drwxr-xr-x - examples
-rwxr-xr-x 1027 mksym.sh
-rw-r--r-- 17 nets.txt
-rw-r--r-- 344 nets2.txt
-rw-r--r-- 28 nets3.txt