Updated Installation (markdown)

Installation.md

@@ -15,4 +15,26 @@ If you don't want to recompile every time when you run your game, you can instal
 
 ```sh
 go install github.com/hajimehoshi/ebiten/...
-```
+```
+
+# Modules
+
+As of Go 1.11, modules are introduced experimentally. If you want to use Ebiten with modules, execute these commands with Go 1.11 beta 2:
+
+```
+# Create your workspace
+mkdir mygo
+cd mygo
+go1.11beta2 mod -init -module example.com/m
+#   The above module name is arbitrary. If you want to make this public on GitHub later,
+#   name it properly like github.com/yourname/yourgame.
+
+# Get the latest Ebiten (This is optional: If you skip this, the latest stable version will be used)
+go1.11beta2 get github.com/hajimehoshi/ebiten@master
+
+# Write your game
+editor main.go
+
+# Run your game
+go1.11beta2 run .
+```