add .gitignore file
add .gitignore file

Signed-off-by: Kent Yoder <a62f2225bf70bfaccbc7f1ef2a397836717377de@linux.vnet.ibm.com>

shpedoikal/tpm-tools,shpedoikal/tpm-tools,shpedoikal/tpm-tools,srajiv/tpm-tools,srajiv/tpm-tools,srajiv/tpm-tools