start of a proper readme

Author: anthony-nhs

README.md

@@ -1 +1,31 @@
 # eps-cdk-utils
+
+This contains a docker image used to deploy cdk to our environments and a cdk-constructs library
+
+# cdk-constructs
+
+This contains common cdk constructs used in eps projects
+
+Available constructs are
+
+- TypescriptLambdaFunction
+
+# development
+
+If you want to test a new construct, add it to packages/cdkConstructs
+Run the following to produce a distributable tarball
+```
+make package
+```
+This will produce a tarball file in lib folder
+
+Copy this to the project you want to use it in and use the following to install it
+
+```
+npm install --save NHSDigital-eps-cdk-constructs-1.0.0.tgz --workspace packages/cdk/ 
+```
+
+You will then be able to use it - eg
+```
+import {TypescriptLambdaFunction} from "@NHSDigital/eps-cdk-constructs"
+```