feat: Add first modules

This adds the first modules blocks from the initial proof of concept, with basic docs.
Currently missing is bundling and usage instructions

src/user_feedback.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# @name User-Feedback
+# @brief Provides useful colored outputs for user feedback on actions
+
+# @description Display error message in stderr, prefixed by check emoji
+# @arg $1 string Error message to display
+show_error() {
+    echo -e "\e[91;1m\u2718 $1" >&2
+}
+
+# @description Display success message in stderr, prefixed by cross emoji
+# @arg $1 string Success message to display
+show_success() {
+    echo -e "\e[92;1m\u2714 $1" >&2
+}