add README.md

Author: SeminKim

ImageProcessingScripts/Animated Image Generator/README.md

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+# Animated Image Generator
+
+## Aim
+
+This is a simple script to concatenate frame images, generating animation.
+
+## Short description
+
+- With all valid image files in ```--target``` directory, a single animated image will be generated and saved
+  as ```--output```.
+- Other valid options are:
+    - ```--speed```: How long a single frame will be shown in resulting animation(in milliseconds).
+    - ```--output_extension```: Instead of designating ```output``` option, one can simply set this to get
+      results.{extension} file in original target directory.
+
+## Workflow
+
+- This script reads all valid image files using ```glob``` module.
+    - Valid image files are files with ```IMG_EXTENSIONS```
+    - Alpha channel will not be used, since it seems gif extension does not support it.
+- Then, they are concatenated by ```Pillow.Image``` module.
+
+## Setup instructions
+
+- The only thing to setup is to install Pillow.
+
+```
+pip install -r requirements.txt
+```
+
+## Output
+
+- Script
+```
+$ python animated_image_generator.py --target "./images" --output_extension "gif" --speed 25
+```
+- Result
+![output_gif](images/result.gif)
+