add documentation how to install server on ubuntu 20.04 and add server version stuff

MareSynchronosServer/Installation-Linux.md

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+# Installing Mare Server on Ubuntu 20.04 Server LTS 
+
+## Important
+- **You _will_ need a valid Certificate for the server.**
+- Set one up using LetsEncrypt or use the one provided by your hoster
+- The server provided is only guaranteed to run under Ubuntu 20.04 Server LTS. For anything else, you are on your own. The server is provided as a standalone .NET application which does not require .NET Core to be installed.
+
+## Copy files over
+- Connect via SCP and copy over all files to some directory
+- The directory will need to be writeable by the user
+
+## Install MSSQL Server 2019 CU
+- Import GPG keys
+    ```sh
+    sudo curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
+    ```
+- Add repository
+    ```sh
+    sudo add-apt-repository "$(curl https://packages.microsoft.com/config/ubuntu/20.04/mssql-server-2019.list)"
+    ```
+- Install SQL Server 2019
+    ```
+    sudo apt-get update
+    sudo apt-get install -y mssql-server
+    ```
+- Run configuration
+    ```
+    sudo /opt/mssql/bin/mssql-conf setup
+    ```
+- Install "3) Express"
+- Set a password
+- Verify server is running
+    ```
+    systemctl status mssql-server --no-pager
+    ```
+- Optional: set up a separate user for Mare Synchronos
+  - I'll let you figure that out yourself
+  - The user will need database creation rights
+
+## Configure Mare Server
+- open provided appsettings.json
+- edit `DefaultConnection` to `"Server=localhost;User=sa;Password=<sa password>;Database=mare;MultipleActiveResultSets=true"`
+  - if you created a separate user for mare on the SQL Server, specify the username and password here
+- edit `CacheDirectory` and set it to a path where the file cache is supposed to be located. i.e. `/home/<user>/servercache`
+  - you will also need to create that folder
+- optional: set Port under edit `Url` and change the `+:5000` to `+:<your port>`
+
+  - Set up `Certificate`
+  - Set `Path` to the certificate file path
+  - Set `Password` to the password of the certificate
+    - If the certificate file is split in private key and public, set `KeyPath` to the private key file
+  - Delete all unused keys from `Certificate`
+
+## Set up Mare Synchonos Server as a Service
+- create new file `/etc/systemd/system/MareSynchronosServer.service` with following contents
+    ```
+    [Unit]
+    Description=Mare Synchronos Service
+
+    [Service]
+    WorkingDirectory=<path to server files>
+    ExecStart=<path to server files>/MareSynchronosServer
+    SysLogIdentifier=MareSynchronosServer
+    User=<the user to run the service with>
+    Restart=always
+    RestartSec=5
+
+    [Install]
+    WantedBy=multi-user.target
+    ```
+- Reload SystemD daemon
+    ```
+    sudo systemctl daemon-reload
+    ```
+- Enable the service with
+  ```
+  sudo systemctl enable MareSynchronosServer
+  ```
+- Start the service with
+    ```
+    sudo systemctl start MareSynchronosServer
+    ```
+- Log in ingame and add a custom server within the Mare Synchronos Plugin configuration under the address `wss://<your server ip>:<your server port>`
+- That should be it and your server ready to go and running