Add disclaimer and discord link to readme.md

README.md

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 CrystalShireEngine (CSE) is an enhanced engine for Pokemon Crystal romhacking.
 
+#### CSE is currently still **under developement**. You will likely experience significant bugs and differences in the engine compared to vanilla pokecrystal. If you wish to use CSE, we highly recommend you join our [discord server](https://discord.gg/dvpf6wcqMn) for support. We need your help to identify bugs, so we may improve the engine for everyone!
+
 ## Features
 
 - **Extended 16-bit Indexes:** Pokemon & Moves. Detailed info & usage can be found at the [pokecrystal16 wiki](https://github.com/vulcandth/pokecrystal16/wiki). Credits: [aaaaaa123456789](https://github.com/aaaaaa123456789), [vulcandth](https://github.com/vulcandth), [Rangi42](https://github.com/Rangi42).