discovery-js: add additional loop exercise

js/tests/count-up-to.json

@@ -0,0 +1,10 @@
+[
+  {
+    "description": "Count up to 3",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nupTo(3)\nequal(\n  args.flat().join('\\n'),\n  `0\n1\n2\n3`,\n)"
+  },
+  {
+    "description": "Count up to 11",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nupTo(11)\nequal(\n  args.flat().join('\\n'),\n  `0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11`,\n)"
+  }
+]

subjects/count-up-to/README.md

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+## Count up to
+
+### Instructions
+
+Declare `upTo` function that takes an `end` number argument.
+
+You must log each number starting at `0` until you reach the `end` value
+(included)
+
+> Example: `upTo(3)` would log: 0 1 2 3