Created Omnidirectional Jump (markdown)

Omnidirectional-Jump.md

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+## Omnidirectional Jump
+
+credits to ghoulslash
+
+This tutorial teaches you how to create a tile behavior that lets you jump over it from any direction
+<a href="https://imgur.com/fT9c6ZV"><img src="https://imgur.com/fT9c6ZV.gif" title="source: imgur.com" /></a>
+
+### Step 1 - create the behavior
+Open [include/constants/metatile_behaviors.h](../blob/master/include/constants/metatile_behaviors.h). Replace an unused behavior with:
+e.g.:
+```diff
+-#define MB_UNUSED_1D 0x1D
++#define MB_OMNIDIRECTIONAL_JUMP 0x1D
+```
+
+### Step 1 - make the behavior do something
+Open [src/event_object_movement.c](../blob/master/src/event_object_movement.c), and find `GetLedgeJumpDirection` and replace the entire function with the following:
+```c
+u8 GetLedgeJumpDirection(s16 x, s16 y, u8 z)
+{
+    static bool8 (*const sLedgeJumpBehaviors[])(u8) = {
+        MetatileBehavior_IsJumpSouth,
+        MetatileBehavior_IsJumpNorth,
+        MetatileBehavior_IsJumpWest,
+        MetatileBehavior_IsJumpEast,
+    };
+
+    u8 behavior;
+    u8 direction = z;
+
+    if (direction == 0)
+        return 0;
+    else if (direction > 4)
+        direction -= 4;
+
+    direction--;
+    behavior = MapGridGetMetatileBehaviorAt(x, y);
+
+    if (sLedgeJumpBehaviors[direction](behavior) || MetatileBehavior_IsOmnidirectionalJump(behavior))
+        return direction + 1;
+
+    return DIR_NONE;
+}
+```
+### Step 3 - make the function recognize the behavior
+Open [src/metatile_behavior.c](../blob/master/src/metatile_behavior.c). Add the following at the end of the file
+```c
+bool8 MetatileBehavior_IsOmnidirectionalJump(u8 metatileBehavior)
+{
+    if (metatileBehavior == MB_OMNIDIRECTIONAL_JUMP)
+        return TRUE;
+    else
+        return FALSE;
+}
+```
+
+Then, open [include/metatile_behavior.h](../blob/master/include/metatile_behavior.h) and add the following somewhere:
+```diff
++bool8 MetatileBehavior_IsOmnidirectionalJump(u8 metatileBehavior);
+```
+