add codemeta doc

README.md

 [![CircleCI](https://circleci.com/gh/rocker-org/rocker-versioned.svg?style=svg)](https://circleci.com/gh/rocker-org/rocker-versioned) [![license](https://img.shields.io/badge/license-GPLv2-blue.svg)](https://opensource.org/licenses/GPL-2.0)
-
+[![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 
 ## Version-stable Rocker images
 

codemeta.json

+{
+  "@context": "https://raw.githubusercontent.com/codemeta/codemeta/master/codemeta.jsonld",
+  "@type": "SoftwareSourceCode",
+  "identifier": "rocker-versioned",
+  "description": "rocker-versioned provides Dockerfiles for versioned instances of R.  The rocker-versioned stack includes base R (rocker/r-ver), RStudio, tidyverse, and verse images for various versions of R. See repository readme for the more details.",
+  "name": "rocker-versioned: Versioned stack of Docker images for R",
+  "codeRepository": "https://github.com/rocker-org/rocker-versioned",
+  "issueTracker": "https://github.com/rocker-org/rocker-versioned/issues",
+  "license": "https://spdx.org/licenses/GPL-2.0",
+  "version": "1.0.0",
+  "programmingLanguage": {
+    "@type": "ComputerLanguage",
+    "name": "Docker",
+    "url": "https://docs.docker.com/engine/reference/builder/"
+  },
+  "provider": {
+    "@type": "Organization",
+    "url": "https://hub.docker.com/",
+    "name": "Docker Hub",
+  },
+  "operatingSystem": ["OSX", "Windows", "Linux"],
+  "runtimePlatform": "Docker",
+  "author": [
+    {
+      "@type": "Person",
+      "givenName": "Carl",
+      "familyName": "Boettiger",
+      "email": "cboettig@gmail.com",
+      "@id": "http://orcid.org/0000-0002-1642-628X"
+    },
+    {
+      "@type": "Person",
+      "givenName": "Dirk",
+      "familyName": "Eddelbuettel",
+      "
+    }
+  ],
+  "copyrightHolder":  "http://orcid.org/0000-0002-1642-628X",
+  "maintainer": "http://orcid.org/0000-0002-1642-628X",
+  "softwareRequirements": [
+    {
+      "@type": "SoftwareApplication",
+      "name": "docker-engine",
+      "version": "1.3",
+      "provider": {
+        "@id": "https://docker.com",
+        "@type": "Organization",
+        "name": "Docker",
+        "url": "https://docker.com"
+      }
+    }
+  ],
+  "contIntegration": "https://circleci.com/gh/rocker-org/rocker-versioned",
+  "developmentStatus": "active",
+  "releaseNotes": "https://github.com/rocker-org/rocker-versioned/blob/master/README.md",
+  "readme": "https://github.com/rocker-org/rocker-versioned/blob/master/README.md",
+  "keywords": ["docker", "R", "rocker", "reproducibility", "containers"]
+}