add help file to print out usage to terminal

Author: D10f

batch_resizer/help.py

@@ -0,0 +1,28 @@
+def print_help():
+    print("""
+    Process images by converting them to different formats and/or resizing them.
+    You may provide one or more images and they'll be processed in parallel
+    for extra speed (actual gains depend on the hardware it runs on).
+
+    usage: main.py  input [input ...] [-o OUTPUT] [-p] [-w width] [-h height]
+                    [-f {.jpg,.jpeg,.png,.webp} [{.jpg,.jpeg,.png,.webp} ...]]
+                    [-v] [--version] [--help]
+
+    positional arguments:
+      input                 One or more image files to process
+
+    optional arguments:
+      -o [OUTPUT], --output-dir [OUTPUT]
+                            Directory where processed images will be saved to
+      -p, --create-parents  Recursively creates any missing parent directories
+      -w WIDTH, --resize WIDTH
+                            Pixel width for the output image (preserves aspect-ratio)
+      -h HEIGHT, --resize HEIGHT
+                            Pixel height for the output image (preserves aspect-ratio)
+      -f {webp,jpeg,jpg,png} [{webp,jpeg,jpg,png} ...], --formats {webp,jpeg,jpg,png} [{webp,jpeg,jpg,png} ...]
+                            Convert processed file to the selected image format
+      -v, --verbose         Writes additional output to the terminal as the program runs
+      --help                Show this help message
+      --version             Prints the current version for the script
+
+    """)