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Add content on 'scope and function stack' (#2165)

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adding content of the scope and function stack node in Javascript roadmap.
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content/roadmaps/106-javascript/content/109-javascript-functions/105-scope-and-function-stack/readme.md
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# Scope and function stack
# Scope and function stack
## Scope
A space or environment in which a particular variable or function can be accessed or used. Accessibility of this variable or function depends on where it is defined.
JavaScript has the following kinds of scopes:
- **Global scope**: The default scope for all code running in script mode.
- **Module scope**: The scope for code running in module mode.
- **Function scope**: The scope created with a function.
- **Block scope**: The scope created with a pair of curly braces (a block).
## Function Stack (Call stack)
The function stack is how the interpreter keeps track of its place in a script that calls multiple functions, like which function is currently executing and which functions within that function are being called.
<ResourceGroupTitle>Free Content</ResourceGroupTitle>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Glossary/Call_stack'>Function stack (call stack) - MDN</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Glossary/Scope'>Kinds of Scope - MDN</BadgeLink>