Add square root exercie

exercises/square-root/canonical-data.json

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+{
+  "exercise": "square-root",
+  "version": "1.0.0",
+  "cases": [
+    {
+      "description": "root of 1",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 1
+      },
+      "expected": 1
+    },
+    {
+      "description": "root of 4",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 4
+      },
+      "expected": 2
+    },
+    {
+      "description": "root of 25",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 25
+      },
+      "expected": 5
+    },
+    {
+      "description": "root of 81",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 81
+      },
+      "expected": 9
+    },
+    {
+      "description": "root of 196",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 196
+      },
+      "expected": 14
+    },
+    {
+      "description": "root of 65025",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 65025
+      },
+      "expected": 255
+    }
+  ]
+}

exercises/square-root/description.md

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+Given a natural radicand, return its square root.
+
+Check out the Wikipedia pages on [square root](https://en.wikipedia.org/wiki/Square_root) and [methods of computing square roots](https://en.wikipedia.org/wiki/Methods_of_computing_square_roots).
+
+Recall that natural numbers are positive real whole numbers (i.e. 1, 2, 3 and up).
+
+When implementing this in a language with a built-in square root function, implement your own function.

exercises/square-root/metadata.yml

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+---
+blurb: "Given a natural radicand, return its square root."
+source: ""
+source_url: ""