Added constants and Timestamp struct

Added all the required constants and the timestamp struct. First structure of the printTimestamp function

Testat-Planer.zig

@@ -0,0 +1,27 @@
+const std = @import("std");
+
+const Timestamp = struct {
+    hours: u64,
+    minutes: u64,
+};
+
+const testees = undefined;
+const number_of_testees: u64 = undefined;   // len von testees
+const total_minutes: u64 = 60;              // Gesamte Dauer in min
+const pause_minutes: u64 = 2;               // Länge der Pause zwischen 2 Testaten
+
+
+pub fn main () !void {
+    var testStamp = Timestamp {
+        .hours = 13,
+        .minutes = 5,
+    };
+    
+    try printTimestamp(&testStamp);
+}
+
+// Printet timestamp im Format HH:MM
+pub fn printTimestamp(ts: *Timestamp) !void {
+    const writer = std.io.getStdOut().writer();
+    try writer.print("{d}:{d}", ts.*);
+}