chore(documentation): Add exists documentation

doc/7/controllers/document/exists/index.md

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+---
+code: true
+type: page
+title: exists
+description: Check if a document exists inside kuzzle
+---
+
+# exists
+
+Check if a document exists.
+
+<br/>
+
+```js
+exists (index, collection, id, [options]);
+```
+
+| Argument     | Type              | Description     |
+| ------------ | ----------------- | --------------- |
+| `index`      | <pre>string</pre> | Index name      |
+| `collection` | <pre>string</pre> | Collection name |
+| `id`         | <pre>string</pre> | Document ID     |
+| `options`    | <pre>object</pre> | Query options   |
+
+### Options
+
+Additional query options
+
+| Options    | Type<br/>(default)               | Description                                                                                                           |
+| ---------- | -------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
+| `queuable` | <pre>boolean</pre><br/>(`true`)  | If true, queues the request during downtime, until connected to Kuzzle again                                          |
+| `refresh`  | <pre>string</pre><br/>(`""`)     | If set to `wait_for`, waits for the change to be reflected for `search` (up to 1s)                                    |
+| `silent`   | <pre>boolean</pre><br/>(`false`) | If `true`, then Kuzzle will not generate notifications <SinceBadge version="7.5.3"/>                                  |
+| [`timeout`](/sdk/7/core-classes/kuzzle/query#timeout)  | <pre>number</pre><br/>(`-1`)     | Time (in ms) during which a request will still be waited to be resolved. Set it `-1` if you want to wait indefinitely |
+
+## Resolves
+
+Resolves a boolean.
+
+## Usage
+
+<<< ./snippets/exists.js

doc/7/controllers/document/exists/snippets/exists.js

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+try {
+  const { result } = await kuzzle.document.exists('nyc-open-data', 'yellow-taxi', 'some-id');
+
+  if (result) {
+    console.log('Success');
+  }
+} catch (error) {
+  console.error(error.message);
+}

doc/7/controllers/document/exists/snippets/exists.test.yml

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+name: document#exists
+description: Check if a document exists in kuzzle
+hooks:
+  before: |
+    curl -XDELETE kuzzle:7512/nyc-open-data
+    curl -XPOST kuzzle:7512/nyc-open-data/_create
+    curl -XPUT kuzzle:7512/nyc-open-data/yellow-taxi
+    curl --fail -H "Content-type: application/json" -XPUT -d '{}' kuzzle:7512/nyc-open-data/yellow-taxi/some-id
+  after:
+template: default
+expected: Success