Square-Root: Add new exercise

exercises/square-root/canonical-data.json

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+{
+  "exercise": "square-root",
+  "cases": [
+    {
+      "uuid": "9b748478-7b0a-490c-b87a-609dacf631fd",
+      "description": "root of 1",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 1
+      },
+      "expected": 1
+    },
+    {
+      "uuid": "7d3aa9ba-9ac6-4e93-a18b-2e8b477139bb",
+      "description": "root of 4",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 4
+      },
+      "expected": 2
+    },
+    {
+      "uuid": "6624aabf-3659-4ae0-a1c8-25ae7f33c6ef",
+      "description": "root of 25",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 25
+      },
+      "expected": 5
+    },
+    {
+      "uuid": "93beac69-265e-4429-abb1-94506b431f81",
+      "description": "root of 81",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 81
+      },
+      "expected": 9
+    },
+    {
+      "uuid": "fbddfeda-8c4f-4bc4-87ca-6991af35360e",
+      "description": "root of 196",
+      "property": "squareRoot",
+      "input": {
+        "radicand": 196
+      },
+      "expected": 14
+    },
+    {
+      "uuid": "c03d0532-8368-4734-a8e0-f96a9eb7fc1d",
+      "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.
+
+Note that the term "radicand" refers to the number for which the root is to be determined. That is, it is the number under the root symbol.
+
+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 also that natural numbers are positive real whole numbers (i.e. 1, 2, 3 and up).

exercises/square-root/metadata.yml

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+---
+blurb: "Given a natural radicand, return its square root."
+source: "wolf99"
+source_url: "https://github.com/exercism/problem-specifications/pull/1582"