Assignment operator + free Resources (#1635)

* Assignment operator + free Resources

Short intro + free reading resources

* Update content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/100-assignment-operators.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/100-assignment-operators.md

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-# Assignment operators
+# Assignment Operators
+
+An assignment operator assigns a value to its left operand based on the value of its right operand. The simple assignment operator is equal (`=`), which assigns the value of its right operand to its left operand. That is, `x = f()` is an assignment expression that assigns the value of `f()` to `x`.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#assignment_operators'>Assignment Operators</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://javascript.info/operators#assignment'>Basic Operators</BadgeLink>