Adding readme

multiplier/README.md

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+# This is a readme!
+
+Programmers include readme files to help people viewing their code understand what it does.
+
+## Multiplier
+
+This simple .NET Core Application runs in a command line. When run, it will prompt for two numbers, multiply them, then write the result to the console.
+
+## Known bugs
+
+- Must be given a number. Excepts if a letter is entered.
+- Fails to process reallllly big numbers (outside the range 5.0 x 10^324 to 1.7 x 10^308)