New examination test

Sd1/P/Etest/Diff/Solution/.gitignore

Sd1/P/Etest/Diff/Solution/pom.xml

...ion/src/main/java/de/hdm_stuttgart/mi/sd1/store/Diff.java

...main/java/de/hdm_stuttgart/mi/sd1/store/package-info.java

.../test/java/de/hdm_stuttgart/mi/sd1/fraction/DiffTest.java

Sd1/P/Etest/Diff/Test/.gitignore

Sd1/P/Etest/Diff/Test/pom.xml

...est/src/main/java/de/hdm_stuttgart/mi/sd1/store/Diff.java

...main/java/de/hdm_stuttgart/mi/sd1/store/package-info.java

.../test/java/de/hdm_stuttgart/mi/sd1/fraction/DiffTest.java