Add day1 examples

day1/examples/CMakeLists.txt

day1/examples/binforms.cc

day1/examples/check_prime.cc

day1/examples/fibonacci.cc

day1/examples/gcd.cc

day1/examples/hanoi.cc

day1/examples/hello_qa.cc

day1/examples/hello_xyz.cc

day1/examples/midpt.cc

day1/examples/min_of_three.cc

day1/examples/namespaces.cc

day1/examples/namespaces2.cc

day1/examples/numsort.cc

day1/examples/onespace.cc

day1/examples/pyscope2.py

day1/examples/raw1.cc

day1/examples/rawstring.cc