Merge pull request #745 from contember/pr/add-contember

Headless CMS: add Contember

Author: domitriusclark

src/site/headless-cms/contember.md

@@ -0,0 +1,37 @@
+---
+title: Contember
+repo: contember/admin
+homepage: https://www.contember.com
+twitter: contember
+opensource: "Yes"
+typeofcms: "API Driven"
+supportedgenerators:
+  - All
+description: Bespoke content management. With Contember you will easily manage your content and data. Build and run GraphQL API and user-centric administration without any hassle.
+images:
+  - path: /img/cms/contember-edit-page-without-shadow.png
+---
+
+## Bespoke content management 
+
+With Contember you will easily manage your content and data. Build and run GraphQL API and user-centric administration without any hassle.
+
+## Main principles
+
+- Everything is code (TypeScript and React).
+- The structure of the data is up to you, Contember doesn't force any arbitrary collections or posts. Create any entities you want with attributes and relationships. Schema overview
+- The administration is not dependent on your data structure. Build any views with few lines of code. Administration introduction
+
+## Highlighted features
+
+- Generates well-structured PosgreSQL database
+- Instantly provides you with GraphQL API
+- Built-in authentication
+- Powerful role-based ACL
+- Automatic database migrations
+- Multi-language, translatable
+- Extend with your own React.js components
+
+## Resources
+
+[Docs](https://docs.contember.com) • [Starter kits](https://github.com/contember/starter-kits) • [Discord](https://discord.gg/DscBctgvMW)