add license to readme

README.md

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+<!-- modrinth_exclude.start -->
 # Roses Mod
 
 > **Note**
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 This mod brings back the classic roses and other classic flowers to minecraft, without replacing any newer flower types.
 
-Features:
+## Features:
 - Roses and Potted Roses
 - Cyan Flowers (Potted Cyan Flowers)
 - Rose Bushes drop roses
 - 2x2 Roses in a crafting table will output a rose bush (and cyan rose bush)
 - Bees can pollinate all flowers
+<!-- modrinth_exclude.end -->
 
+## Building
+
+This is a multi-module gradle project, each version set has its own submodule,
+and is essentially an isolated mod, and will have its own gradle tasks, and even required JDK.
+
+### [Licensed Under LGPL-3.0](./LICENSE.txt)