add helpers library

.config/yadm/bootstrap.d/lib/helpers

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Download file and return filename
+download() {
+    [[ $# == 0 ]] && exit 1
+
+    local url="$1"
+    local suffix="${2:-"${url##*.}"}"
+    local filename="$(mktemp -t "download-XXXXXX.${suffix}")"
+
+    curl --location --output "${filename}" -# "${url}"
+
+    echo "${filename}"
+}
+
+test() {
+    echo "Test function"
+}