Un-hardcode block documentation

Opens it up for all our custom blocks to be able to provide information.

Need a texture from @Yulife.

src/main/java/WayofTime/bloodmagic/api/iface/IDocumentedBlock.java

@@ -0,0 +1,35 @@
+package WayofTime.bloodmagic.api.iface;
+
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.text.ITextComponent;
+import net.minecraft.world.World;
+
+import javax.annotation.Nonnull;
+import java.util.List;
+
+/**
+ * Marks blocks as one that is documented.
+ *
+ * This documentation can be read by an {@link WayofTime.bloodmagic.item.ItemSanguineBook} (or child)
+ */
+public interface IDocumentedBlock
+{
+    /**
+     * Provides the documentation to provide to the player. Usually a short'n'sweet description about basic usage.
+     *
+     * @param player
+     *      - The EntityPlayer attempting to view the Documentation.
+     * @param world
+     *      - The World interaction is happening in.
+     * @param pos
+     *      - The BlockPos being interacted at.
+     * @param state
+     *      - The IBlockState of the interacted Block.
+     *
+     * @return - A list of formatted ITextComponent to provide to the player. Provide an empty list if there is no available documentation.
+     */
+    @Nonnull
+    List<ITextComponent> getDocumentation(EntityPlayer player, World world, BlockPos pos, IBlockState state);
+}