Merge branch 'master' into 'main'

.gitignore

lances-curve.iml

src/main/LancesCurve.java

src/main/Main.java

src/main/Plan.java

src/main/exception/DateOrderException.java

src/test/LancesCurveTest.java

src/test/data/LancesCurveKataData.java

src/test/data/LancesCurveTestsData.java