add files

Doble_Spiel/Startcode/numbers.h

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+#ifndef NUMBERS_H
+#define NUMBERS_H
+
+// Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
+// Returns NULL on errors. Use your implementation of the binary search tree to check for possible duplicates while
+// creating random numbers.
+unsigned int *createNumbers(unsigned int len);
+
+// Returns only the only number in numbers which is present twice. Returns zero on errors.
+unsigned int getDuplicate(const unsigned int *numbers, unsigned int len);
+
+#endif