Add multilingual language and systems learning tracks

tl/vlang-practice-20261101/lesson-3/main.v

@@ -0,0 +1,11 @@
+fn remaining(total int, done int) int {
+    if done >= total { return 0 }
+    return total - done
+}
+fn main() {
+    assert remaining(4,1)==3
+    assert remaining(4,4)==0
+    assert remaining(4,5)==0
+    assert remaining(0,0)==0
+    println('Pumasa')
+}