Add umbox init template

Signed-off-by: Marek Maškarinec <[email protected]>

Author: marekmaskarinec

etc/umbox_init/README.md

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+# UmBox + Tophat
+
+You have successfully initialized an UmBox box from the tophat template.
+For more information about tophat, visit [tophat2d.dev](https://tophat2d.dev).

etc/umbox_init/box.json

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+{
+	"name": "tophat_box",
+	"author": "unknown",
+	"version": "v0.1.0",
+	"license": "BSD-3",
+	"readme": "README.md",
+	"include": [],
+	"description": "My Tophat based box",
+	"dependencies": [ "tophat" ],
+	"run_posix": "./umbox/tophat/tophat",
+	"run_windows": "./umbox/tophat/tophat.exe"
+}

etc/umbox_init/init.tar

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+
+import (
+	"canvas.um"
+	"th.um"
+	"window.um"
+)
+
+fn init*() {
+	window::setup("Hello Tophat!", 640, 480)
+
+	window::onFrame.register({
+		canvas::drawText("Hello Tophat!", { 5, 5 }, th::black, 4)
+	})
+}