Test that sha256 object format is supported

diff --git a/README.md b/README.md
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+Clone this repository in order to check whether your git installation supports the sha256 object format:
+
+    git init --object-format=sha256 --initial-branch=main test-sha256
+    cd test-sha256
+    git remote add origin https://git.djapps.eu/tmp/test-sha256
+    git pull origin main
+    git branch --set-upstream-to=origin/main main
+    
+    cat README.md
+