Created How to add multiple accounts from the same instance (markdown)

How-to-add-multiple-accounts-from-the-same-instance.md

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+Many users of Sengi seems to be mislead by the authentication workflow of Mastodon, so if you want to add multiple accounts, please follow those steps:
+
+1. Add the first account
+2. When adding the second account from the same instance, you'll see your already logged first account, don't authorize nor deny
+3. Log-out from the first account via the log-out button: 
+
+   ![auth page of mastodon with the log-out button](https://user-images.githubusercontent.com/5437247/81615710-0c69aa00-93b0-11ea-8558-f57955afac88.png)
+
+4. Mastodon doesn't always redirect properly at that step, if it's not the case, close and reopen Sengi
+5. Add the second account
+
+Now you have both accounts in Sengi!