Collect examples for chapter 1

chapter_01/examples/CMakeLists.txt

chapter_01/examples/binforms.cc

chapter_01/examples/check_prime.cc

chapter_01/examples/dangling_pr/outer_ptr.cc

chapter_01/examples/dangling_pr/ref_heap.cc

chapter_01/examples/dangling_pr/ref_local.cc

chapter_01/examples/exception.cc

chapter_01/examples/fibonacci.cc

chapter_01/examples/gcd.cc

chapter_01/examples/hanoi.cc

chapter_01/examples/hello_qa.cc

chapter_01/examples/hello_xyz.cc

chapter_01/examples/midpt.cc

chapter_01/examples/min_of_three.cc

chapter_01/examples/namespaces.cc

chapter_01/examples/namespaces2.cc

chapter_01/examples/numsort.cc

chapter_01/examples/onespace.cc

chapter_01/examples/pyscope2.py

chapter_01/examples/raw1.cc