Update README.md

lnbits/extensions/usermanager/README.md

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 <h1>User Manager</h1>
 <h2>Make and manager users/wallets</h2>
 To help developers use LNbits to manage their users, the User Manager extention allows the creation and management of users and wallets. For example, a games developer may be developing a game that needs each user to have their own wallet, LNbits can be included in the develpoers stack as the user and wallet manager.
-<img src="https://i.imgur.com/P1tvBSG.png">
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-<h2>API endpoints</h2>
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-<code>curl -X GET http://YOUR-TOR-ADDRESS</code>