Adds transfer.sh plugin

plugins/transfer/README.md

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+# Transfer.sh
+
+[Transfer.sh](https://transfer.sh/) plugin - easy file sharing from the command line
+
+## Usage
+Just type `transfer hello.txt` and let the magic happen

plugins/transfer/transfer.plugin.zsh

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+# From https://transfer.sh/
+# Modified by Gabriel Kaam <gabriel@kaam.fr>
+
+function transfer() {
+  if [[ $# -eq 0 ]]; then
+    cat >&2 <<EOF
+No arguments specified.
+
+Usage: transfer /tmp/test.md
+cat /tmp/test.md | transfer test.md
+
+Learn more: https://transfer.sh/
+EOF
+    return 1
+  fi
+
+  local basefile url infile="$1"
+
+  basefile=$(omz_urlencode "${infile:t}")
+
+  if [[ -z $infile ]]; then
+    infile="-"
+  fi
+
+  url=$(curl --progress-bar --upload-file "$infile" "https://transfer.sh/$basefile")
+
+  echo $url
+}
+
+alias transfer=transfer