Add some GraalVM notes + sample scan of Trace Agent

GRAALVM.md

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+GraalVM Support
+===
+
+This is an experimental support branch for GraalVM.
+
+Running
+---
+This is easy.
+
+If we are using the recent GraalVM 23, we only need to bump Scala 2.13 and SBT to the latest version.  
+Ocelot Desktop seem to work out of the box.
+
+Native Image
+---
+This is tricky.
+
+Ocelot relies on a lot of reflection. So we need to work around it.
+
+### 1. Replace Log4J
+It is simply not compatible with native images ([logback seems to work](https://github.com/spring-projects/spring-boot/issues/33470)).
+
+### 2. Run the Trace Agent
+Add the following VM option:
+```shell
+-agentlib:native-image-agent=config-output-dir=/ocelot-desktop-folder/src/main/resources/META-INF/native-image/
+```
+The `/src/main/resources/META-INF/native-image/` folder is important here - 
+this is where GraalVM will be looking for a file named `reachability-metadata.json`.
+
+The agent will try to detect all the reflective references happening at runtime.  
+It may not catch everything from the first try, because the code has to be executed to be detected.
+
+There are options to merge scan results and to dump them at some intervals, etc.
+
+### 3. Build a fat JAR
+```sbt
+sbt assembly
+```
+
+### 4. Run Native Image compiler
+For example:
+```shell
+C:\Users\xxx\.jdks\graalvm-ce-23.0.0\bin\native-image -jar C:\Users\xxx\IdeaProjects\ocelot-desktop\target\scala-2.13\ocelot-desktop.jar
+```
+We are simply giving it the path to the fat JAR from the previous step.
+
+This command will generate a bunch of `*.dll` and the `ocelot-desktop.exe` file in the current directory.
+
+### 5. Hope for the best