Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/is-docker/readme.md

@@ -0,0 +1,27 @@
+# is-docker
+
+> Check if the process is running inside a Docker container
+
+## Install
+
+```
+$ npm install is-docker
+```
+
+## Usage
+
+```js
+const isDocker = require('is-docker');
+
+if (isDocker()) {
+	console.log('Running inside a Docker container');
+}
+```
+
+## CLI
+
+```
+$ is-docker
+```
+
+Exits with code 0 if inside a Docker container and 2 if not.