Added sddm graphics folder for the sddm login theme - (Solves- #76)

[pranav1698]

Fixes #76

Checklist

• [x] I have read the Contribution & Best practices Guide and my PR follows them.
• [x] My branch is up-to-date with the Upstream master branch.
• [x] I have added necessary documentation (if appropriate)
• [ ] Added breif description with screenshots.

Changes proposed in this pull request:

• Added the sddm graphics folder for the sddm login theme The pr is subset for solving the issue #70

Thank you!

[pranav1698]

@tabesin @meets2tarun please review

[pranav1698]

@tabesin @meets2tarun @abishekvashok please review

[pranav1698]

@abishekvashok please review.