Update readme with installation steps
Update readme with installation steps

AnswerConsulting/idcr-poc,RippleOSI/NE-HSCIE-Core,AnswerConsulting/idcr-poc,nhs-digital/gpconnect,RippleOSI/NE-HSCIE-Core,AnswerConsulting/idcr-poc,RippleOSI/NE-HSCIE-Core,nhs-digital/gpconnect,nhs-digital/gpconnect