initial login form implementation

[mmannings]

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Vitro-angular GitHub issue:#20

• Requires vivo-project/Vitro-angular#[pr-number] (if a REST API PR is required to test this)
• Other Relevant Links (Mailing list discussion, related pull requests, etc.)

What's new?

Login page with post request to /api/login (for example: http:localhost/vivo/api/login)

How should this be tested?

A description of what steps someone could take to:

• Go to <vitro_angular_address>/login (default: localhost:4200/login). Or use button "Login".
• Provide username and password.
• Press "Login". if everything's fine you'll be redirected to home path ([""]) and you'll see in a console (F12) writings "Login successful". Otherwise, in a console you'll see error with a status code.

Additional Notes:

This PR is too raw, it needs further revisions.

Interested parties

@wwelling @VeljkoMaksimovic

Checklist

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• [+] My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• [+] My PR doesn't introduce circular dependencies
• [+] If my PR includes new, third-party dependencies (in package.json), I've made sure their licenses align with the Vitro-angular License.

[mmannings]

William, one question I wanted to ask you. On your screens in slack or from your pull request #19 , I've seen that you don't have any warning or errors in your console regarding CORS. I'm just asking because after starting the project: npm run start and going to localhost:4200, I still see CORS error for the default link http://localhost:8080/api/docs/rest/1
Error is: Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8080/api/docs/rest/1. (Reason: CORS request did not succeed). Status code: (null).
Did you do something additionally with the cors-filter, like applying it to the whole Tomcat. Or that's just some of mine own error.

[ghost]

@SoulsMark I am running VIVO docker compose and have applied the same CORS filter from Vitro web.xml.