Updated Guide (markdown)

Guide.md

@@ -8,7 +8,19 @@
 
 1. Implement the required members from `DesktopMagicPluginAPI.Plugin`
 
-1. Compile it into a `.dll` file and in the plugin directory create a directory with the same name as the `.dll` file without the file extension and put the `.dll` file with all required dependencies into it.
+1. Compile it to a `.dll` file. 
+
+1. In the plugin directory create a directory with the same name as the `.dll` file without the file extension and put the `.dll` file with all required dependencies into it.
+
+## General information
+
+### The `Main` method
+The `Main` method is where the main processing of the plugin should take place.\
+The method is executed in a different thread, which means you can run things with heavy load there without affecting the main application or other plugins.\
+You must return a `bitmap` from this method to display the output in the plugin window.
+
+### Event handlers
+All events are normally raised in the main thread of the DesktopMagic application, so they should not contain code that blocks the main thread.
 
 ## Examples
 
@@ -45,6 +57,8 @@ namespace DesktopMagicPlugin
 
 ### Input example
 
+In this example, the user can enter a string that will be displayed on the image.
+
 ```cs
 using DesktopMagicPluginAPI;
 using DesktopMagicPluginAPI.Inputs;