phone_number: initial commit

cpp/phone-number/README.md

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+# Phone Number
+
+Write a program that cleans up user-entered phone numbers so that they can be sent SMS messages.
+
+The rules are as follows:
+
+- If the phone number is less than 10 digits assume that it is bad
+  number
+- If the phone number is 10 digits assume that it is good
+- If the phone number is 11 digits and the first number is 1, trim the 1
+  and use the last 10 digits
+- If the phone number is 11 digits and the first number is not 1, then
+  it is a bad number
+- If the phone number is more than 11 digits assume that it is a bad
+  number
+
+We've provided tests, now make them pass.
+
+Hint: Only make one test pass at a time. Disable the others, then flip
+each on in turn after you get the current failing one to pass.
+
+## Getting Started
+
+Make sure you have read the [getting started with C++](http://help.exercism.io/getting-started-with-cpp.html)
+page on the [exercism help site](http://help.exercism.io/).  This covers
+the basic information on setting up the development environment expected
+by the exercises.
+
+## Passing the Tests
+
+Get the first test compiling, linking and passing by following the [three
+rules of test-driven development](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd).
+Create just enough structure by declaring namespaces, functions, classes,
+etc., to satisfy any compiler errors and get the test to fail.  Then write
+just enough code to get the test to pass.  Once you've done that,
+uncomment the next test by moving the following line past the next test.
+
+```C++
+#if defined(EXERCISM_RUN_ALL_TESTS)
+```
+
+This may result in compile errors as new constructs may be invoked that
+you haven't yet declared or defined.  Again, fix the compile errors minimally
+to get a failing test, then change the code minimally to pass the test,
+refactor your implementation for readability and expressiveness and then
+go on to the next test.
+
+Try to use standard C++11 facilities in preference to writing your own
+low-level algorithms or facilities by hand.  [CppReference](http://en.cppreference.com/)
+is a wiki reference to the C++ language and standard library.  If you
+are new to C++, but have programmed in C, beware of
+[C traps and pitfalls](http://www.slideshare.net/LegalizeAdulthood/c-traps-and-pitfalls-for-c-programmers).
+
+## Source
+
+Event Manager by JumpstartLab [view source](http://tutorials.jumpstartlab.com/projects/eventmanager.html)