Added interpolation arg, updated docs, provided Dockerfile + instructions

Dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.12-slim-bookworm
+
+WORKDIR /app
+
+COPY video_to_gif.py /app/video_to_gif.py
+
+RUN apt update && \
+    apt upgrade && \
+    apt install ffmpeg -y
+
+ENTRYPOINT ["python", "video_to_gif.py"]