Create a basic FAQ (#115)

FAQ.md

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+# Frequently Asked Questions
+
+## Table of Contents
+
+- Using invidious
+  * [Can I use Invidious on my device?](#q-can-i-use-invidious-on-my-device)
+  * [Do you plan to make an Android/iOS app?](#q-do-you-plan-to-make-an-androidios-app)
+
+- Commonly encountered errors
+  * [The media could not be loaded…](#q-the-media-could-not-be-loaded)
+  * [Could not check out a connection in 2.0 seconds (DB::PoolTimeout)](
+    #q-could-not-check-out-a-connection-in-20-seconds-dbpooltimeout)
+
+- Running your own instance
+  * [Do you provide pre-built binaries (`.deb`, `.rpm`, etc..)?](
+    #q-do-you-provide-pre-built-binaries-deb-rpm-etc)
+  * [How can I configure _[thing]_?](#q-how-can-i-configure-thing)
+  * [RSS feeds/links/etc... URLs redirect to `<IP>:3000` but I have a reverse proxy!](
+    #q-rss-feedslinksetc-urls-redirect-to-ip3000-but-i-have-a-reverse-proxy)
+  * [The "popular" feed/page on my instance is empty!](
+    #q-the-popular-feedpage-on-my-instance-is-empty)
+
+
+# Using invidious
+
+## **Q:** Can I use Invidious on my device?
+
+**A:** As long as your device is equipped with a modern web browser,
+sure, of course! A responsive interface is available for mobile/tablets.
+
+<br/>
+
+## **Q:** Do you plan to make an Android/iOS app?
+
+**A:** No. Invidious is and will always be a browser application.
+
+If you have an Android phone/tablet, you can check the
+[NewPipe](https://github.com/TeamNewPipe/NewPipe/) application.
+
+<br/>
+
+
+# Commonly encountered errors
+
+## **Q:** The media could not be loaded…
+
+**A:** This problem can occur when Youtube sends corrupted video data.
+Try switching instance. Reloading the page a few times may also help.
+
+_Note:_ If you're trying to listen to music, you will have to go to Youtube.
+This type of content is protected by DRM. We currently don't support those.
+
+<br/>
+
+## **Q:** Could not check out a connection in 2.0 seconds (DB::PoolTimeout)
+
+**A: Please, do not open a bug report on github, we can't do anything!**
+
+The instance you are using is having _database issues_. Please use another
+instance from the [list of public instances](https://instances.invidious.io)
+
+<br/>
+
+
+# Running your own instance
+
+## **Q:** Do you provide pre-built binaries (`.deb`, `.rpm`, etc.)?
+
+**A:** We currently don't provide those, due to the rolling release nature
+of Invidious. Get a fresh `clone` or `pull` the latest commits from `master`
+instead.
+
+<br/>
+
+## **Q:** How can I configure _[thing]_?
+
+**A:** Read the example config file (`config/config.example.yml`).
+All the supported configuration options are documented there.
+
+<br/>
+
+## **Q:** RSS feeds/links/etc... URLs redirect to `<IP>:3000` but I have a reverse proxy!
+
+**A:** Make sure that the following parameters are set accrodingly to your environment:
+- `https_only`: if your instance is served over HTTPs
+- `domain`: if you have a domain name that redirects to your instance
+- `external_port`: if your instance is accessed from a different port than
+  the listening one (e.g your instance listens on :3000, but is available on 
+  :443 through a reverse proxy, set `external_port` to `443`)
+
+<br/>
+
+## **Q:** The "popular" feed/page on my instance is empty!
+
+**A:** The "popular" feed is generated from the videos that are popular amongst
+the users registered on your instance. If nobody has created an account on your
+instance (e.g if registration is disabled) the popular feed will be empty.