Added design.md (exercism#7)

* added design.md added : currency-exchange/.meta/design.md
OMEGA-Y · Nov 28, 2020 · 8717d50 · 8717d50
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+## Goal
+
+The goal of this exercise is to teach the student how to use arithmetic operators and type casting between `int` and `float` in Python
+
+## Learning objectives
+
+- use `+`, `-`, `*`, `/` to add, subtract, multiply, divide numbers(`int` and `float`).
+- use `int()` to cast `float` to `int`.