update compiler page

Author: Foso

docs/general/compiler_plugin.md

@@ -1,8 +1,59 @@
 # Compiler Plugin
 
-Compose works by transforming all Kotlin functions that are annotated with @Composable.
+Compose works by transforming all Kotlin functions that are annotated with **@Composable** and adding code for the Compose Runtime.
 To do that it uses a Kotlin Compiler Plugin.
 
+
+For instance, this Composable: 
+```kotlin
+@Composable
+fun Hello(name: String) {
+    Text(name)
+}
+```
+
+
+will be transformed and compiled to Jvm ByteCode. Below you can see the decompiled code as Java code
+
+```java
+@Metadata(
+        mv = {1, 5, 1},
+        k = 2,
+        xi = 48,
+        d1 = {"\u0000\u0010\n\u0000\n\u0002\u0010\u0002\n\u0000\n\u0002\u0010\u000e\n\u0002\b\u0002\u001a\u0015\u0010\u0000\u001a\u00020\u00012\u0006\u0010\u0002\u001a\u00020\u0003H\u0007¢\u0006\u0002\u0010\u0004¨\u0006\u0005"},
+        d2 = {"Hello", "", "name", "", "(Ljava/lang/String;Landroidx/compose/runtime/Composer;I)V", "app_debug"}
+)
+public final class GreetingKt {
+    @Composable
+    public static final void Hello(@NotNull final String name, @Nullable Composer $composer, final int $changed) {
+        Intrinsics.checkNotNullParameter(name, "name");
+        $composer = $composer.startRestartGroup(274849561);
+        ComposerKt.sourceInformation($composer, "C(Hello)7@166L10:Greeting.kt#tlkiwl");
+        int $dirty = $changed;
+        if (($changed & 14) == 0) {
+            $dirty = $changed | ($composer.changed(name) ? 4 : 2);
+        }
+
+        if (($dirty & 11 ^ 2) == 0 && $composer.getSkipping()) {
+            $composer.skipToGroupEnd();
+        } else {
+            TextKt.Text-fLXpl1I(name, (Modifier)null, 0L, 0L, (FontStyle)null, (FontWeight)null, (FontFamily)null, 0L, (TextDecoration)null, (TextAlign)null, 0L, 0, false, 0, (Function1)null, (TextStyle)null, $composer, 14 & $dirty, 0, 65534);
+        }
+
+        ScopeUpdateScope var4 = $composer.endRestartGroup();
+        if (var4 != null) {
+            var4.updateScope((Function2)(new Function2() {
+                public final void invoke(@Nullable Composer $composer, int $force) {
+                    GreetingKt.Hello(name, $composer, $changed | 1);
+                }
+            }));
+        }
+
+    }
+}
+```
+
+
 ## Where can i find the source code
 https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/compose/compiler/compiler-hosted/