lowest common ancestor in bt (dsa 450)

[dhruvin5]

Related Issue

• Info about the related issue
  Provided solution of the problem Lowest common ancestor of binary tree of DSA 450
  Closes: Lowest Common ancestor in binary tree #516

Describe the changes you've made

C++ solution (with commented explanations) of DSA 450 problem Lowest common ancestor of binary tree
I have created a c++ file in the DSA folder/Binary trees with the same name as that of the problem
I have also updated the readme

Mention any unusual behaviour of your code (Write NA if not)

Any unusual behaviour of your code

Checklist:

(To mark, write x inside the square brackets like this: [x])

• My code follows the guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly whereever it was hard to understand.
• My changes generate no new warnings.

Additional Info (optional)

Any additional information you want to give

[dhruvin5]

Can you please check this @kanak22

[kanak22]

Make a folder of this question inside binary tree folder and then add the codefile in it.

[dhruvin5]

okayy

[dhruvin5]

I made the changes @kanak22