add basic Readme

# Validation scripts for 3GPP projects

# OpenAPI validation

Files:

* `validate-all.sh`: Bash script to validate all OpenAPIs in a folder with `swagger-cli validate`

* `Jenkinsfile`: A Groovy Jenkinsfile to describe the build process to validate openapis

# YANG validation

Files:

* `validate-data-models.sh`: Bash script to validate the files with `pyang --strict`

* `lint-data-models.sh`: Bash script to validate the files with `pyang --lint`

* `sa5-data-models-validation.jenkinsfile`: A Groovy Jenkinsfile to describe the build process to validate YANG

# Test

The test directory contains scripts to validate this project.

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