Resized splash screen asset images added

[vivekshotti]

Description

Fixes #178

Type of Change:

• User Interface

Code/Quality Assurance Only

• New assets (non-breaking change which adds assets pre-approved by mentors)

How Has This Been Tested?

As requested in the Issue #178 , splash screen images and other logos have been resized to specified sizes as mentioned in the issue #178 .

The details of sucessfull requested changes are as follows:

Background - no logo:

• [x] background iPad (2200x2200)

  Transparent background logo and title:

• [x] Launch image logo iPhone (960x960)
• [x] Launch image logo iPad (1100x1100)

  Splash screen - background + logo + title

• [x] Android splash screen mdpi 360x640
• [x] Android splash screen hdpi 540x960
• [x] Android splash screen xhdpi 720x1280
• [x] Android splash screen xxhdpi 1080x1920
• [x] Android splash screen sw600dp 1280x800

Checklist:

Delete irrelevant options.

• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-review of my own code or materials

Code/Quality Assurance Only

• [x] My changes generate no new warnings

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[HeroicHitesh]

@anitab-org/designers please review this PR

[annabauza]

Images looks good. @HeroicHitesh just check expected resolutions if it's good approved - do not merge please. Thanks.

[devkapilbansal]

@Vivek-Hotti thanks for your contribution. I am closing this PR for now but this is approved for Open Source Hack. We will look into this when needed