flutterfire-configure: add page

[Noibisjunior]

This PR adds a new TLDR page for the flutterfire configure command, part of the FlutterFire CLI used to configure a Firebase project for a Flutter app.

• The page is in the correct platform directory: common.
• The page has at most 8 examples.
• The page description has a link to documentation.
• The page follows the content guidelines.
• The page follows the style guide.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known): FlutterFire CLI v1.0.0-dev.54

[Managor]

Remove the unrelated files.

[Noibisjunior]

Remove the unrelated files.

Fixed and Deleted, Thanks

[tldr-bot]

The build for this PR failed with the following error(s):

pages/common/jsonTool.md:0: TLDR109 File name should be lowercase

Please fix the error(s) and push again.

[Managor]

The unnecessary files are still there. Delete them.

[Managor]

Why did you ask for my review when you didn't address my request?

[Noibisjunior]

The unnecessary files are still there. Delete them.

I have deleted them completely, please check.

Thanks

[spageektti]

Hi. Thanks for your contribution.

[spageektti]

@Managor @sebastiaanspeck can you check if I added the file correctly? It was first time I was using git in termux

[Managor]

Github claims that there is only one file changed so I assume you got it right

[MachiavelliII]

Thanks for your contribution, and welcome to tldr!