Add evaluator
diff --git a/ide/icons/square.svg b/ide/icons/square.svg
new file mode 100644
index 0000000..3a4587b
--- /dev/null
+++ b/ide/icons/square.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M405.333 64H106.667C83.198 64 64 83.198 64 106.667v298.666C64 428.802 83.198 448 106.667 448h298.666C428.802 448 448 428.802 448 405.333V106.667C448 83.198 428.802 64 405.333 64z"/></svg>
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