Add tutorial sliders for first time launch of app

[saketkumar]

Summary of changes

Fixes https://github.com/zulip/zulip-android/issues/161

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[saketkumar]

@vishwesh3 yeah i tried same the first time but all layouts have different sizes and of imagview and paddings so it is difficult to have same dimensions in all the 4 layouts

[nitish1211]

@saketkumar95 How about using the App intro Library Material AppIntro? Both look the same but It would cut down on the lines of code. :)

[saketkumar]

@nitish1211 The library looks awesome but we are using simple intro slides and i just used 1 class and 4 layouts so it doesn't make sense for using library for that only. We already have lots of library and apk size is already high right now. :)

[meghalagrawal]

Anyone Working on this ?

I want to work on ViewPager and add Multiple instances of Fragment instead of 4 Different Layouts.

[Sam1301]

@saketkumar95 thanks for working on this! 👍

One issue: I noticed the shadow under the toolbar and menu in zulipActivity are lost.

[kunall17]

@saketkumar95 I would want to merge this, can you fix the comments posted by saumya?

[saketkumar]

@kunall17 Yeah i will do this in 1-2 days, currently busy in my lab exams. :/

[zulipbot]

@saketkumar95, your pull request has developed a merge conflict! Please review the most recent commit (f791888) for conflicting changes and resolve your pull request's merge conflicts.