add missing neug.h

src/neug.h

@@ -0,0 +1,11 @@
+#define NEUG_NO_KICK      0
+#define NEUG_KICK_FILLING 1
+
+#define NEUG_PRE_LOOP 16
+
+void neug_init (uint32_t *buf, uint8_t size);
+void neug_prng_reseed (void);
+uint32_t neug_get (int kick);
+void neug_kick_filling (void);
+void neug_flush (void);
+void neug_wait_full (void);