feat: add fs tools (#59)

tools/fs_write.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -e
+
+# @describe Write the contents to a file at the specified path.
+# If the file exists, only the necessary changes will be applied.
+# If the file doesn't exist, it will be created.
+# Always provide the full intended contents of the file.
+
+# @env FS_BASE_DIR=. The base dir
+# @option --path! The path of the file to write to
+# @option --contents! The full contents to write to the file
+
+main() {
+    path="$FS_BASE_DIR/$argc_path"
+    mkdir -p "$(dirname "$path")"
+    printf "%s" "$argc_contents" > "$path"
+    echo "The contents written to: $path"
+}
+
+eval "$(argc --argc-eval "$0" "$@")"