Add Spearly CMS to headless-CMS list.

src/site/headless-cms/spearly.md

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+---
+title: Spearly CMS
+homepage: https://cms.spearly.com
+twitter: spearlycom
+opensource: "No"
+typeofcms: "API Driven"
+supportedgenerators:
+  - All
+description: Spearly CMS is a headless CMS easy to embed and easy to use. You can embed content into your site for few steps.
+images:
+  - path: /img/cms/spearly-manager.png
+---
+## Spearly CMS
+
+[Spearly CMS](https://cms.spearly.com) is a headless CMS easy to embed and easy to use. You can embed content into your site for few steps.
+
+Spearly CMS improve your making experience of site.
+
+### Features
+
+- REST API.
+- Embed JavaScript Library.
+- Team feature: Spearly has team feature for managing content with multiple users.
+- Form feature: Online form creator and embed form easily.
+- Preview feature: You can get preview of content by using preview key.
+- WebHook feature
+
+### Embed JavaScript Syntax
+
+You can embed a content by following code:
+
+```
+<div cms-loop>
+  <h1>{%= content_title %}</h1>
+  <p>{%= content_description %}</p>
+</div>
+```
+
+### Searply Series
+
+Spearly CLOUD:
+
+- Hosting and deploying your site from GitHub or static site files.
+- Spearly CLOUD can set the original domain.