Update readme

README.md

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 # Scratch++
-#### Scratch++ is a Scratch mod that adds new blocks which can compile to normal Scratch.
+#### Scratch++ is a Scratch mod that adds new blocks which can compile to normal Scratch. This allows for easily building advanced Scratch projects, which you can share normally.
 
 ## How to use
 Example:

src/playground/index.ejs

@@ -85,6 +85,9 @@
                     <li>GarboMuffin - Scratch++ makes use of the TurboWarp compression algorithm.</li>
                     <li>Xeltalliv - Scratch++ makes use of the ScratchTools compression algorithm.</li>
                 </ul>
+
+                Warning:
+                Due to the nature of how Scratch++ works, large projects mey not be uploadable to Scratch. To counteract this issue, try reducing the number of sprites that use large custom blocks. (Eg: using physics blocks in every sprite makes the compiler inject the physics engine in to every sprite.)
             </p>
         </div>
         <div id="sppsettings"