Add product description to README.md

README.md

@@ -1,6 +1,18 @@
-# Crust
+# What is CRUST?
 
-@todo What is Crust
+**CRUST Messaging** is a high performance, self-hosted, open source Slack alternative. It has an API centric design and all data is exchange is in JSON format. CRUST Messaging is tightly coupled with CRUST IAM.
+
+**CRUST CRM** is a highly scalable, self-hosted, open source Salesforce alternative. It provides a suite of tools to build API centric microservice modules. CRUST CRM can be loosely coupled with CRUST Messaging for the purposes of customer engagement and addition of rich external data sources. All data exchange is in JSON format. Business Logic, Workflow, Search and AI (later!) can be applied across both CRM and Messaging stores. CRUST CRM is tightly coupled with CRUST IAM.
+
+**CRUST IAM** is an advanced Identity and Access Management infrastructure which includes:
+- Social Logins
+- Single Sign On
+- Multi-factor Authentication
+- User Identity Self-Service
+- Advanced User and Organisational Privacy Controls
+- Standardised ANSI Role Based Access Control
+
+**CRUST Client** is a multi-functional client which unifies the user experience of CRUST IAM, Messaging and CRM, allowing organisations to extend access to the third party applications internal and external to their firewall (e.g. Video, Docs, Dev Tools) via a common user interface. The design is inspired by popular browser UX, though not identical. CRUST Client will be available on web, desktop and mobile platforms.   
 
 ## Contributing