feat: add Redis setup

doc/redis.md

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+# Setup Redis
+
+* update apt repository cache
+```
+sudo apt update
+```
+
+* install redis
+```
+sudo apt install redis-server --no-install-recommends
+```
+
+* check if service is running
+```
+systemctl status redis-server
+```
+
+* verify used port
+```
+ss -tlpn
+```
+
+* create backup of default configuration
+```
+sudo cp /etc/redis/redis.conf /etc/redis/redis.conf.bak
+```
+
+* open config file
+```
+sudo vi /etc/redis/redis.conf
+```
+
+* increase the memory of the server by adding these two lines in the end of the configuration file
+```
+maxmemory 500mb 
+maxmemory-policy allkeys-lru
+```
+
+* apply config changes
+```
+sudo systemctl restart redis-server
+```
+
+* test service sending ```ping``` using the client
+```
+redis-cli
+```
+
+# Other
+
+* start service
+```
+sudo systemctl start redis-server
+```
+
+* enable service to start with the system
+```
+sudo systemctl enable redis-server
+```

doc/redis.md.license

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+/*
+ * SPDX-FileCopyrightText: 2022 Software Ingenieur Begerad <swingbe.de>
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */