chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/basic-javascript/cf1111c1c11feddfaeb3bdef.md

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+---
+id: cf1111c1c11feddfaeb3bdef
+title: Add Two Numbers with JavaScript
+challengeType: 1
+forumTopicId: 16650
+dashedName: add-two-numbers-with-javascript
+---
+
+# --description--
+
+`Number` is a data type in JavaScript which represents numeric data.
+
+Now let's try to add two numbers using JavaScript.
+
+JavaScript uses the `+` symbol as an addition operator when placed between two numbers.
+
+**Example:**
+
+```js
+const myVar = 5 + 10;
+```
+
+`myVar` now has the value `15`.
+
+# --instructions--
+
+Change the `0` so that sum will equal `20`.
+
+# --hints--
+
+`sum` should equal `20`.
+
+```js
+assert(sum === 20);
+```
+
+You should use the `+` operator.
+
+```js
+assert(/\+/.test(__helpers.removeJSComments(code)));
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+const sum = 10 + 0;
+```
+
+# --solutions--
+
+```js
+const sum = 10 + 10;
+```