Update square-root description.md

exercises/square-root/instructions.md

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+# Instructions
+
+Your task is to calculate the square root of a given number.
+
+- Try to avoid using the pre-existing math libraries of your language.
+- As input you’ll be given a positive whole number, i.e. 1, 2, 3, 4…
+- You also only need to output a positive whole number.
+
+Here are some approaches you could use.
+
+- Linear or binary search for a number that gives the input number when squared.
+- Successive approximation using Newton's or Heron's method.
+- Calculating one digit at a time or one bit at a time.
+
+You can check out the Wikipedia pages on [integer square root][integer-square-root] and [methods of computing square roots][computing-square-roots] to help with choosing a method of calculation.
+
+[integer-square-root]: https://en.wikipedia.org/wiki/Integer_square_root
+[computing-square-roots]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots

exercises/square-root/introduction.md

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+# Introduction
+
+We are launching a deep space exploration rocket and we need a way to make sure the navigation system stays on target.
+
+The first step in our coordinate calculation involves taking a number as input and finding another number which multiplied by itself will equal our input number, or in other words, finding the square root of our input number.
+
+The journey will be very long.
+To make the batteries last as long as possible, we had to make our rocket’s onboard computer very power efficient.
+Unfortunately that means that we can’t rely on fancy math libraries and functions, as they use more power.
+Instead we want to calculate or approximate the square root directly.