Added Backend development

Explanation: Added Backend development skills and roadmap.

[x] The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
[x] The PR explanation includes the words "Fixes #bugnum: ..." (or "Fixes part of #bugnum" if the PR only partially fixes an issue).
[x] The PR does not break any part of the existing code.
[x] The PR creator have carefully read & adher to the contributing guidelines of the project.
[x] The PR is made to the branch that's called "develop".
[x] The PR is made from a branch that is up-to-date with "develop".
[x] Have you followed the guidelines in the Contributing document?
[x] Have you checked to ensure there aren't other open Pull Requests for the same tech?
[x] Is your submission is according to the desired pattern ?
[x] Have you placed the contents in the Readme.md keeping the sorting order in mind ?
[x] Have you placed the contents in the Dictionary.json keeping the sorting order in mind ?

Does you submission include -