Initial downloadFile Page commit.

downloadFile.md

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+The Function `downloadFile` contains 3 Parameters.
+
+`file` -> Which means the Download URL to the File.
+
+`output` -> Which means the place, where the downloaded File should be placed.
+
+`message` -> The Message, which should be displayed while downloading.
+
+You can find an example here:
+```
+        {
+            "type": "downloadFile",
+            "file": "https://github.com/Universal-Team/extras/raw/master/builds/Universal-Updater/Universal-Updater.cia",
+            "output": "sdmc:/Universal-Updater.cia",
+            "message": "Downloading Universal-Updater.cia"
+        }