Added validation instructions to fhir questionnaires (#149)

* Added README instructions to how to validate fhir resources

* updated instructions

* fixed type

* fixed naming

* fixed typo

validation/README.md

@@ -0,0 +1,21 @@
+### How to validate FHIR Questionnaires ###
+Once you have the generate the fhir json using SUSHI, proceed with the following steps to vlaidate a given fhir resource against the IG:
+
+1. [Download the latest FHIR Validator CLI](https://github.com/hapifhir/org.hl7.fhir.core/releases/latest/download/validator_cli.jar) 
+
+2. [Retreive the package.tgz from the deployed IG ](https://github.com/kind-lab/kind-lab.github.io/raw/main/vbai-fhir/package.tgz) or get it one from the output folder after running `./_genonce.sh`
+
+3. To ensure the FHIR validator works with your IG, perform the following command in the directory where the package.tgz is stored:
+
+```
+tar -xvzf package.tgz
+cd package/
+cp -a example/. .
+rm -r example
+cd ..
+tar -cvzf package-new.tgz package
+
+```
+4. Now take any of the output fhir jsons and validate with the IG using the following command: `java -jar validator_cli.jar path/to/json -version 4.0.1 -ig path/to/package-new.tgz -questionnaire required`
+
+