Running Shoes, new readme, Munchlax

This adds a readme with credits so far. Make sure to keep this updated so everyone knows what is and isn't done!

We also get the Running Shoes feature from the tutorial, finally making debugging bearable given how laggy Crystal's overworld can be at times.

Oh, and Munchlax.

engine/overworld/events.asm

@@ -284,6 +284,14 @@ PlayerEvents:
 	xor a
 	ld [wLandmarkSignTimer], a
 
+	; Have player stand (resets running sprite to standing if event starts while running)
+	ld a, [wPlayerState]
+	cp PLAYER_RUN
+	jr nz, .ok2
+	ld a, PLAYER_NORMAL
+	ld [wPlayerState], a
+	farcall UpdatePlayerSprite
+
 .ok2
 	scf
 	ret

engine/overworld/player_movement.asm

@@ -276,7 +276,8 @@ DoPlayerMovement::
 
 ; Downhill riding is slower when not moving down.
 	call .BikeCheck
-	jr nz, .walk
+	;jr nz, .walk
+	jr nz, .HandleWalkAndRun
 
 	ld hl, wBikeFlags
 	bit BIKEFLAGS_DOWNHILL_F, [hl]
@@ -317,6 +318,25 @@ DoPlayerMovement::
 	xor a
 	ret
 
+.HandleWalkAndRun
+	ld a, [wWalkingDirection]
+	cp STANDING
+	jr z, .ensurewalk
+	ldh a, [hJoypadDown]
+	and B_BUTTON
+	cp B_BUTTON
+	jr nz, .ensurewalk
+	ld a, [wPlayerState]
+	cp PLAYER_RUN
+	call nz, .StartRunning
+	jr .fast
+
+.ensurewalk
+	ld a, [wPlayerState]
+	cp PLAYER_NORMAL
+	call nz, .StartWalking
+	jr .walk
+
 .TrySurf:
 	call .CheckSurfPerms
 	ld [wWalkingIntoLand], a
@@ -783,6 +803,22 @@ ENDM
 	pop bc
 	ret
 
+.StartRunning:
+	ld a, PLAYER_RUN
+	ld [wPlayerState], a
+	push bc
+	farcall UpdatePlayerSprite
+	pop bc
+	ret
+
+.StartWalking:
+	ld a, PLAYER_NORMAL
+	ld [wPlayerState], a
+	push bc
+	farcall UpdatePlayerSprite
+	pop bc
+	ret
+
 CheckStandingOnIce::
 	ld a, [wPlayerTurningDirection]
 	cp 0