Add substitutes characters for Windows file names

Author: Richienb

contributing.md

@@ -6,6 +6,20 @@
 
 The name of the file will be displayed as-is in the readme. It should be named according to the language it was written in. The name shouldn't be abbreviated too far (use `JavaScript.js` instead of `JS.js`) and it shouldn't be abbreviated too little (use `CSS.css` instead of `Cascading Style Sheets.css`). Additionally, use spaces instead of hyphens or underscores (use `Objective C.m` instead of `Objective-C.m`).
 
+If a file name contains a special character that Windows is not able to display, substitute it with the following:
+
+|Original|Substitute|
+|:-:|:-:|
+|/|∕|
+|\\ |＼|
+|:|˸|
+|\*|∗|
+|?|？|
+|"|＂|
+|<|﹤|
+|>|﹥|
+|\||❘|
+
 #### Contents
 
 The code in the file should be the simplest and most straightforward way to print/display/show `Hello World` exactly once in the language used. User input should not be request and a newline should only be printed when necessary.