Update README.md

Author: vitabaks

README.md

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-# postgresql_cluster
-PostgreSQL High-Availability Cluster (based on "Patroni" and "DCS(etcd)"). Automating deployment with Ansible.
+# PostgreSQL High-Availability Cluster
+### PostgreSQL High-Availability Cluster (based on "Patroni" and "DCS(etcd)"). Automating deployment with Ansible.
+
+This Ansible playbook is designed to deploy a PostgreSQL High-Availability Cluster on dedicated physical servers, for a production environment.
+
+For test environments and small projects with a low load, can be deployed on the virtual servers.
+
+A choice of two options given deployment scheme ("Type A" and "Type B"):
+
+
+### [Type A] PostgreSQL High-Availability with Load Balancing
+![TypeA](https://github.com/vitabaks/postgresql_cluster/blob/master/TypeA.png)
+
+description will be added very soon ...
+
+### [Type B] PostgreSQL High-Availability only
+![TypeB](https://github.com/vitabaks/postgresql_cluster/blob/master/TypeB.png)
+
+description will be added very soon ...
+
+
+#### Compatibility
+RedHat and Debian based distros.
+
+###### minimum os versions:
+- RedHat: 7
+- CentOS: 7
+- Ubuntu: 16.04
+- Debian: 8
+
+:white_check_mark: tested, works fine: Debian 9, Ubuntu 18.04, CentOS 7.
+
+###### PostgreSQL versions: 
+- 9.4
+- 9.5
+- 9.6
+- 10
+- 11
+
+all supported PostgreSQL versions
+
+:white_check_mark: tested, works fine: PostgreSQL 9.6, 10, 11.
+
+
+#### Requirements
+*coming soon...*
+
+
+### Quick start
+*coming soon...*
+
+
+#### Variables
+*coming soon...*
+
+#### License
+Licensed under the MIT License. See the [LICENSE](https://github.com/vitabaks/postgresql_cluster/blob/master/LICENSE) file for details.
+
+
+#### Author
+Vitaliy Kukharik (PostgreSQL DBA) [email protected]
+
+
+#### Feedback, bug-reports, requests, ...
+Are [welcome](https://github.com/vitabaks/postgresql_cluster/issues)!