adding xacc observe example

Signed-off-by: Alex McCaskey <mccaskeyaj@ornl.gov>
3 jobs for master in 16 seconds (queued for 1 second)
Name Stage Failure
failed
docker build Build
Cloning into 'opt/curl'...
error: RPC failed; curl 56 GnuTLS recv error (-54): Error in the pull function.
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
fatal: clone of 'https://github.com/whoshuu/curl.git' into submodule path 'opt/curl' failed
Failed to recurse into submodule path 'tpls/cpr'
The command '/bin/sh -c git clone --recursive https://github.com/eclipse/xacc && cd xacc && mkdir build && cd build && cmake .. -DPYTHON_INCLUDE_DIR=/usr/include/python3.5 && make -j4 install' returned a non-zero code: 128
ERROR: Job failed: exit status 1