Add ocr-numbers introduction

exercises/ocr-numbers/description.md → exercises/ocr-numbers/instructions.md

@@ -1,4 +1,4 @@
-# Description
+# Instructions
 
 Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
 

exercises/ocr-numbers/introduction.md

@@ -0,0 +1,6 @@
+# Introduction
+
+Your best friend Marta recently landed their dream job working with a local history museum's collections.
+Knowing of your interests in programming, they confide in you about an issue at work for an upcoming exhibit on computing history.
+A local university's math department had donated several boxes of historical printouts, but given the poor condition of the documents, the decision has been made to digitize the text.
+However, the university's old printer had some quirks in how text was represented, and your friend could use your help to extract the data successfully.