added Tree traversal techniques inorder, preorder and postorder in c++ lang

[ghost]

PR for issue #101
All traversals are based on recursion.

[ghost]

Could you please tell me how long it would take to get hacktoberfest-accepted label??
Is the pr not elligible for that?
Thanks

[Anuja-19]

@abhstract
I have already merged the PR. It is not necessary to put a label on it. Your review period must have started 9 days ago. Please check once.

[ghost]

@Anuja-19
Ok but one more thing that I noticed is I am unable to find my contribution in the folders. Actually being new to github I expected to see my it. Is this somehow related to hacktoberfest?? or have I done some mistake while deleting the file during pull request??
Thanks

[Anuja-19]

I see that you have added an empty file to cpp folder.. You need to edit the file with valid code.

[ghost]

So basically what I am asking is in case of mutiple pr's The first pr would contain a single change whereas the second one would contain both the changes right?? because I found my second file having 3 changes do I deleted the previous change.

[Anuja-19]

When you create a PR and do the changes twice, it means you have one pr with multiple commits. So it is only one PR with multiple changes that you do not need to delete.
Now it just shows an empty file, please see if you can edit the file and add code in that empty file.

[ghost]

@Anuja-19 Please review my pull request at the earliest.
Thanks.