Fix instructions to create a null release (#62)

It is vital that the release is created and it as a non-empty file (via @nkraetzschmar )

Author: fwilhe

README.md

@@ -103,6 +103,11 @@ Create a branch to remove all files / actions, place a README to record the hist
 ```
  git tag null
  git push origin null
+```
+ - Create the Release (important), with a non-empty file
+```
+ echo null > ~/null
+ gh release create null ~/null --latest --notes null --title 'ignore package for repo import'
 ```
  - Archive the repo in GitHub 
 ```