Mouse move tutorial.

tutorials/Mouse_Events/main.md

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+# Getting Started with Compose for Desktop
+
+## What is covered
+
+In this tutorial we will see how to install mouse even listeners on components
+in Compose for Desktop.
+
+## Mouse event listeners
+
+Let's create a text, and install pointer move filter on it:
+```kotlin
+import androidx.compose.desktop.Window
+import androidx.compose.foundation.Text
+import androidx.compose.foundation.layout.*
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.pointerMoveFilter
+import androidx.compose.ui.unit.IntSize
+import androidx.compose.ui.unit.sp
+
+
+fun main() = Window(title = "Compose for Desktop", size = IntSize(400, 400)) {
+    var overText = remember { mutableStateOf("Move mouse over text:") }
+    Text(
+            text = overText.value,
+            fontSize = 40.sp,
+            modifier = Modifier
+                    .wrapContentSize(Alignment.Center)
+                    .pointerMoveFilter(
+                    onMove = {
+                        if (it.x > 10 && it.y > 10)
+                            overText.value = "Move position: $it"
+                        false
+                    },
+                    onEnter = {
+                        overText.value = "Over enter"
+                        false
+                    },
+                    onExit = {
+                        overText.value = "Over exit"
+                        false
+                    }
+            )
+    )
+}
+
+```