Moving hardcoded URLs from About Activity to a constant file

Summary: There are many hardcoded strings which makes them difficult to locate and change the URL in case needed, so I think we should move them build.gradle file.

like

@OnClick(R.id.about_credits)
    public void launchCredits(View view) {
        Utils.handleWebUrl(this,Uri.parse("https://github.com/commons-app/apps-android-commons/blob/master/CREDITS/\\"));
    }

    @OnClick(R.id.about_privacy_policy)
    public void launchPrivacyPolicy(View view) {
        Utils.handleWebUrl(this,Uri.parse("https://github.com/commons-app/apps-android-commons/wiki/Privacy-policy\\"));
    }


    @OnClick(R.id.about_faq)
    public void launchFrequentlyAskedQuesions(View view) {
        Utils.handleWebUrl(this,Uri.parse("https://github.com/commons-app/apps-android-commons/wiki/Frequently-Asked-Questions\\"));
    }

Would you like to work on the issue? Yes

[madhurgupta10]

@maskaravivek I think, test can be written easily by using IntentMatchers.hasData() and passing the URL string from the constant file 😃

[maskaravivek]

Will it be difficult to write a unit test if the urls are in a constants file?