Update README.md

Author: megai2

README.md

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 # loader-core
-Core addon loading library for guild wars 2
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+Core addon loading library for Guild wars 2
+
+Original idea: https://github.com/Archomeda/gw2-addon-loader
+
+[![](https://img.shields.io/discord/384735285197537290.svg?logo=discord&logoColor=f0f0f0)](https://discord.gg/5epjQEj)
+
+# Features
+
+In short: loads addons on game start and provides basic addon API functionality.
+
+## Addon DLL loading
+
+On start loads compatible DLLs than conform to name "<GW2 directory>/addons/addon_name/gw2addon_addon_name.dll" and have addon exports. 
+   
+## Addon API
+
+Addon API includes several parts:
+
+1. Addon loading functions to load and unload addons on fly
+2. Function registry to share functions between addons
+3. Event registry to perform some sender/subscriber logic.
+
+Details in <include/gw2al_api.h>
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