Fix nodejs support.

samples/cat-text/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+  dough_sample
+}
+
+kotlin {
+  sourceSets {
+    commonMain {
+      dependencies {
+        implementation(project(":dough-fs"))
+      }
+    }
+  }
+}

samples/cat-text/hello.txt

@@ -0,0 +1 @@
+Hello World

samples/cat-text/src/commonMain/kotlin/main.kt

@@ -0,0 +1,9 @@
+import gay.pizza.dough.fs.PlatformFsProvider
+import gay.pizza.dough.fs.readString
+
+fun main() {
+  val currentWorkingDirectory = PlatformFsProvider.currentWorkingDirectory
+  val helloTextPath = currentWorkingDirectory.resolve("hello.txt")
+  val content = helloTextPath.readString()
+  println(content)
+}