Add configuration for Optifine's better grass

assets/minecraft/optifine/bettergrass.properties

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+ 
+# Configuration for OptiFine's Better Grass feature
+# Location: /assets/minecraft/optifine/bettergrass.properties
+
+# Blocks
+# Enable Better Grass for specific blocks
+grass=true
+grass_path=true
+mycelium=true
+podzol=true
+
+# Snowy blocks
+# Enable Better Grass for specific blocks which have snow on top
+grass.snow=true
+mycelium.snow=true
+podzol.snow=true
+
+# Multilayer grass sides
+# - layer 1 = grass_side
+# - layer 2 = grass (colored by biome)
+# Allows transparent grass texture to be used as overlay for the grass side
+grass.multilayer=true
+
+# Textures
+# Configure which textures to be used 
+# The "texture.grass" is colored by biome
+texture.grass=block/grass_block_top
+texture.grass_side=block/grass_block_side
+texture.grass_path=block/grass_path_to
+texture.grass_path_side=block/grass_path_side
+texture.mycelium=block/mycelium_top
+texture.podzol=block/podzol_top
+texture.snow=block/snow