Add text for --help command in CLI

Close #12

main.go

@@ -11,6 +11,7 @@ import (
 func main() {
 
     if slices.Contains(os.Args, "--help") {
+        cli.ShowHelpText();
     } else if slices.Contains(os.Args, "--version") {
         cli.ShowVersion();
     } else if slices.Contains(os.Args, "--check-update") {

src/cli/ShowHelpText.go

@@ -0,0 +1,32 @@
+package cli
+
+import (
+    "fmt"
+)
+
+func ShowHelpText() {
+
+    fmt.Println(`museum-digital uploader
+
+A tool to manage the configuration of imports to museum-digital and simplify the upload process.
+
+Commands:
+
+(no command), --webui               Runs a small dashboard and opens a browser to view it.
+                                    Use this for using the app without the command line.
+--show-config                       Show current config in JSON format.
+--run-manual-setup                  Opens a CLI-based settings dialogue.
+--set-additional-setting            Allows setting optional, parser-specific settings.
+--upload                            Upload data for import.
+--webdav-remote-list-toplevel       Show folder contents of the WebDAV share used for imports.
+--webdav-remote-list-metadata-dir   Show folder contents of the WebDAV share used for imports (metadata subdirectory).
+--webdav-remote-list-media-dir      Show folder contents of the WebDAV share used for imports (media subdirectory).
+--local-list-metadata               Lists metadata files currently present in the upload directory.
+--local-list-media                  Lists media files currently present in the upload directory.
+--help                              Print help message.
+--check-update                      Check for updates to this application.
+
+Links:
+Source code: https://gitea.armuli.eu/museum-digital/museum-digital-webdav-uploader`)
+
+}

src/cli/ShowVersion.go

@@ -0,0 +1,11 @@
+package cli
+
+import (
+    "fmt"
+    "gitea.armuli.eu/museum-digital/museum-digital-webdav-uploader/src/meta"
+)
+
+// Prints current version.
+func ShowVersion() {
+    fmt.Println(meta.GetVersion())
+}

src/cli/cli.go

@@ -372,11 +372,6 @@ func ListLocalMedia() {
 
 }
 
-// Prints current version.
-func ShowVersion() {
-    fmt.Println(meta.GetVersion())
-}
-
 // Prints, if there is a current version.
 func CheckVersionIsUpToDate() {