docs(readme): improve installation section

README.md

@@ -12,20 +12,35 @@ If you are looking for a way to validate xml against a xsd in the browser, have
 
 ## Getting Started
 
-The module is currently published to a private registry on this GitLab instance.
+The module is currently published to a public registry on this GitLab instance.
+
+<details>
+  <summary><b>npm</b> Instructions</summary>
+
 To install it you have to create a `.npmrc` in the root of your project with the following content.
 
 ```
 @d-ptb:registry=https://gitlab1.ptb.de/api/v4/packages/npm/
-
-# the following auth token is a public read only one
-//gitlab1.ptb.de/api/v4/projects/:_authToken=yyhHC6-HhSZ8zxu4BS-_
-//gitlab1.ptb.de/api/v4/packages/npm/:_authToken=yyhHC6-HhSZ8zxu4BS-_
-//gitlab1.ptb.de/api/v4/projects/105/packages/npm/:_authToken=yyhHC6-HhSZ8zxu4BS-_
 ```
 
 After that you can run `npm install @d-ptb/dcc-js`.
 
+</details>
+
+<details>
+  <summary><b>yarn</b> Instructions</summary>
+
+To install it you have to create a `.yarnrc.yml` in the root of your project with the following content.
+
+```
+npmScopes:
+  d-ptb:
+    npmRegistryServer: "https://gitlab1.ptb.de/api/v4/packages/npm/"
+```
+
+After that you can run `yarn add @d-ptb/dcc-js`.
+
+</details>
 
 ## Example