moved files out of subdirectories, added required documentation

src/leprechaun.h

@@ -0,0 +1,19 @@
+#ifndef __LEPRECHAUN_H__
+#define __LEPRECHAUN_H__
+
+#include "enemy.h"
+
+class leprechaun final: public enemy_base {
+        static const int STEAL_GOLD = 3;
+        static const int BOOSTED_ATK = 50;
+        static const int STARTING_GOLD = 5;
+        int gold_cnt;
+public:
+        leprechaun(RNG *rng, const feature enabled_features, const position &pos,
+                   const int gen_room_num);
+        const char *get_race_name() const override;
+        long_result attack(character *ch) override;
+        int dies(level *lvl) override;
+};
+
+#endif