doc update

- added instructions for installing build tools to README

README.md

@@ -6,6 +6,12 @@ DTP Sites is an open source blogging platform built on Node.js and the DTP ecosy
 
 The only qualified operated system for hosting a DTP Sites suite is [Ubuntu 20.04 LTS](https://releases.ubuntu.com/20.04/). It is acceptable to run it in a virtual machine for development and testing, but it should be run as close to bare metal as can be had for production environments.
 
+## Install Build Tools (for mediasoup support)
+
+```sh
+apt-get -y install build-essential python3-pip
+```
+
 ## Install Data Tier Components
 
 You will need MongoDB and MinIO installed and running before you can start DTP Sites web services.