Add README

Author: alexanderkiel

README.md

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+# Golang FHIR Models
+
+This repository contains a FHIR® R4 models for Go. The models consist of Go structs for each resource and data type. The structs are suitable for JSON encoding/decoding. 
+
+## Features
+
+* resources implement the [Marshaler][1] interface
+* unmarshal functions are provided for every resource
+* enums are provided for every ValueSet used in a [required binding][2], has a computer friendly name and refers only to one CodeSystem
+
+## TODOs
+
+*  #1
+*  #2
+
+## License
+
+Copyright 2019 The Samply Development Community
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+
+[1]: <https://golang.org/pkg/encoding/json/#Marshaler>
+[2]: <https://www.hl7.org/fhir/terminologies.html#strength>