Added bluetooth notes to the knowledge base

knowledge base/bluetooth.md

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+# Bluetooth
+
+## Troubleshooting
+
+### Bluetooth devices take a long time to connect
+
+> Enabling this option will use more power.
+
+In `/etc/bluetooth/main.conf`, under the `General` section, set `FastConnectable` to `true`:
+
+```diff
+[General]
+# Permanently enables the Fast Connectable setting for adapters that
+# support it. When enabled other devices can connect faster to us,
+# however the tradeoff is increased power consumptions. This feature
+# will fully work only on kernel version 4.1 and newer. Defaults to
+# 'false'.
+- #FastConnectable = true
++ FastConnectable = true
+```
+
+### Bluetooth devices cannot be used at login
+
+In `/etc/bluetooth/main.conf`, under the `Policy` section, set `Autoenable` to `true`:
+
+```diff
+[Policy]
+# AutoEnable defines option to enable all controllers when they are found.
+# This includes adapters present on start as well as adapters that are plugged
+# in later on. Defaults to 'false'.
+- #AutoEnable = false
++ AutoEnable = true
+```
+
+## Further readings
+
+- [Failing to use bluetooth keyboard at login]
+
+[failing to use bluetooth keyboard at login]: https://archived.forum.manjaro.org/t/failing-to-use-bluetooth-keyboard-at-login/145056/12