feat(kept-promise): add subject

js/tests/kept-promise_test.js

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+import keptPromise 
+
+const getImportantInfo = _ =>
+  new Promise(resolve => {
+    setTimeout(_ => resolve(Math.round(Math.random() * 10)), 1000)
+  })

subjects/devops/kept-promise/README.md

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+## kept-promise
+
+### Instructions
+
+Thing in your code does not always happen as fast as you would like.
+
+Sometimes it is important to wait for a function to finish before keep going on with your life.
+
+Create an asynchronous function `processInfo` in the file `kept-promise.js`. The function `processInfo` will take an asynchronous function as an input, and it will print the message `Ok!` if the return of the input function is zero or a multiple of two, `Error!` otherwise.
+
+The following function can be used as an example of input function for `processInfo`:
+
+```js
+const getImportantInfo = _ =>
+  new Promise(resolve => {
+    setTimeout(() => resolve(Math.round(Math.random() * 10)), 1000)
+  })
+```
+
+> Assume that your function will always get a valid input function 
+
+### Example
+
+The following script `main.js` can be used to test your function:
+
+```js
+import processInfo from './kept-promise.js'
+
+const getImportantInfo = _ =>
+  new Promise(resolve => {
+    setTimeout(() => resolve(Math.round(Math.random() * 10)), 1000)
+  })
+
+console.log(await processInfo(getImportantInfo))
+```
+
+The output should be the following:
+
+```console
+$  node main.js
+Ok!
+$  node main.js
+Error!
+$  node main.js
+Ok!
+$
+```
+
+### Notions
+
+- [Using promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises)
+- [async function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function)