Created Fix Snow Weather (markdown)

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+## Fix Snow Weather
+
+In vanilla emerald (and Fire Red!) the WEATHER_SNOW is broken and will only emit a few snowflakes before stopping. Let's fix it!
+
+For starters, open [src/field_weather_effects.c](../blob/master/src/field_weather_effect.c)
+
+### Increase the number of snowflakes (optional)
+If you want to have the snow be heavier (or lighter), find `Snow_InitVars` and edit the line `gWeatherPtr->targetSnowflakeSpriteCount = 16;` to a value of your choosing.
+
+### Stop the snow from disappearing
+Find the function `UpdateSnowflakeSprite`, and delete the following code (lines 974-998):
+```c
+    y = (sprite->pos1.y + sprite->centerToCornerVecY + gSpriteCoordOffsetY) & 0xFF;
+    if (y > 163 && y < 171)
+    {
+        sprite->pos1.y = 250 - (gSpriteCoordOffsetY + sprite->centerToCornerVecY);
+        sprite->tPosY = sprite->pos1.y * 128;
+        sprite->tFallCounter = 0;
+        sprite->tFallDuration = 220;
+    }
+    else if (y > 242 && y < 250)
+    {
+        sprite->pos1.y = 163;
+        sprite->tPosY = sprite->pos1.y * 128;
+        sprite->tFallCounter = 0;
+        sprite->tFallDuration = 220;
+        sprite->invisible = TRUE;
+        sprite->callback = WaitSnowflakeSprite;
+    }
+
+    if (++sprite->tFallCounter == sprite->tFallDuration)
+    {
+        InitSnowflakeSpriteMovement(sprite);
+        sprite->pos1.y = 250;
+        sprite->invisible = TRUE;
+        sprite->callback = WaitSnowflakeSprite;
+    }
+```
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