[datatransfer] added data upload docs

Author: MrClock8163

docs/commands/data/index.rst

@@ -16,3 +16,4 @@ transfer commands can be used for simple download and upload operations.
     :maxdepth: 1
 
     download
+    upload

docs/commands/data/upload.rst

@@ -0,0 +1,21 @@
+Uploading
+=========
+
+Data can be uploaded to instruments through a serial connection, by simply
+sending the file data line by line. Most instruments, that support data
+uploads through serial, accept coordinate data in CSV format. Some instruments
+also support their own specialized database record formats.
+
+.. caution::
+    :class: warning
+
+    Currently only ASCII encodable files can be uploaded. Older instruments
+    do not accept special code pages like windows-1252 and other extended
+    ASCII sets (especially not modern unicode), so accented characters have
+    to be avoided.
+
+Usage
+-----
+
+.. click:: instrumentman.datatransfer:cli_upload
+    :prog: iman upload data