Added guide to enable Blizzard Authentictor support

Home.md

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 Welcome to the Aegis wiki!
+
+# Partially supported authenticators
+## 1. Blizzard Authenticator
+
+To enable support for Blizzard Authenticator keys in Aegis follow these steps:
+
+1. Get Blizzard Authenticator app and enable it
+2. Get serial number and restore code from app
+3. Install [python-bna](https://github.com/jleclanche/python-bna) by cloning the repo and installing locally with `pip3 install --user -e .` or install it by using the command `pip3 install bna`
+4. Restore authenticator with `bna restore --set-default $SERIAL $CODE`
+5. Get secret with bna show-secret and manually add it to Aegis (SHA1, 8 Digits) or produce an image with qrencode using the command `bna show-url | qrencode -o ~/Desktop/bnet.png` and scan the image in Aegis
+6. Verify that both authenticators give the same code and after that uninstall Blizzard Authenticator. It is recommended to delete the key from python-bna since the config file can be easily read and keys stolen. The config is stored in `~/.config/bna/bna.conf`
+
+[Source](https://github.com/beemdevelopment/Aegis/issues/179)