added documentation for sqlite database as wallet storage

Signed-off-by: Christian <[email protected]>

Author: chriamue

Databases.md

@@ -0,0 +1,17 @@
+# Databases
+
+Your wallet stores secret keys, connections and other information.
+You have different choices to store this information.
+The wallet supports 2 different databases to store data, SQLite and PostgresDB.
+
+## SQLite
+
+If the wallet is configured the default way in eg. [demo-args.yaml](demo/demo-args.yaml), without explicit wallet-storage, a sqlite database file is used.
+
+```yaml
+wallet-type: indy
+wallet-name: wallet
+wallet-key: wallet-password
+```
+
+For this configuration, a folder called wallet will be created which contains a file called `sqlite.db`.