added anki

wiki/anki.md

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+# Anki
+
+[Anki](https://apps.ankiweb.net/) is a flashcard program for learning.
+
+## Setup
+
+Anki can be split up into client and server software.
+The server software is fully optional, handles the syncing between multiple clients and can also be
+done via the official Anki website.
+
+### Setup Client
+
+The default Anki client is made for computer systems and can be installed from source as described
+[on GitHub](https://github.com/ankitects/anki).
+Alternatively some [Linux](/wiki/linux.md) [package managers](/wiki/linux/package_manager.md) 
+package the Anki client in the `anki` package.
+
+Adding to the Computer clients there are various possible clients for other platforms.
+
+- [AnkiDroid](https://f-droid.org/de/packages/com.ichi2.anki/) is a client for
+  [Android](/wiki/android.md).
+
+### Setup Server
+
+The syncserver can be installed to handle the syncing of data in a self-hosted way.
+It is described [on GitHub](https://github.com/ankitects/anki/tree/main/docs/syncserver) and can be
+setup via [Docker](/wiki/docker.md) using
+[the official manually build container](/wiki/docker/ankitects_-_syncserver.md).
+
+## Usage
+
+This section addresses the usage of Anki.
+
+### Add Backwards Cards
+
+When setting up a new deck and sometimes when importing a deck only cards for one-way learning are
+added.
+This guide assumes the default Anki client is used.
+To change this select `Browse` and then navigate to the `Note Type` the deck to add backwards cards
+uses.
+Right click the note type and select `Cards`.
+Afterwards the cards for backwards learning can be added by `Options` and `Add Card Types...`.
+You can confirm the fields have been setup correctly by clicking through the card types and
+verifying it.
+
+### Make New Cards Gather Order Random
+
+This section is based on a
+[Anki forum entry by NameLessGO](https://forums.ankiweb.net/t/what-are-the-best-settings-here-to-review-cards-in-random-order/27112).
+By default new cards are gathered in order and then also shown in order.
+Most of the time it is useful for them to be gathered in order as it conserves the learning units
+for example.
+To change this navigate to the `Options` of a deck and then change `New card sort order` to
+`Random` to randomize them before showing them without gathering them randomly.
+To change this the `New card gather order` can also be set to `Random notes` or `Random cards`.