Added midterm notes

INFO-1272 (JS 1)/Notes/Midterm/index.js

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+// Window dialogue boxes
+window.alert("This is an alert!");
+window.prompt("This is a prompt");
+window.confirm("This is a confirm");
+
+// Data types
+let userAge = Number("22");
+let userName = String("Levi");
+let isAdmin = Boolean(1);
+console.log("User age: " + userAge);
+console.log("User name: " + userName);
+console.log("Is admin? " + isAdmin);
+
+// Weakly-typed variables
+
+// Constants
+
+// Operators
+
+// Math object methods
+
+// Number object methods
+
+// String object methods
+
+// Selection structure
+
+// Functions
+
+// Repitition structure