Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+# GIF en- and decoding library [![Build Status](https://github.com/image-rs/image-gif/workflows/Rust%20CI/badge.svg)](https://github.com/image-rs/image-gif/actions)
+
+GIF en- and decoder written in Rust ([API Documentation](https://docs.rs/gif/)).
+
+# GIF encoding and decoding library
+
+This library provides all functions necessary to de- and encode GIF files. 
+
+## High level interface
+
+The high level interface consists of the two types
+[`Encoder`](https://docs.rs/gif/*/gif/struct.Encoder.html) and [`Decoder`](https://docs.rs/gif/*/gif/struct.Decoder.html).
+
+### Decoding GIF files
+
+```rust
+// Open the file
+use std::fs::File;
+let input = File::open("tests/samples/sample_1.gif").unwrap();
+// Configure the decoder such that it will expand the image to RGBA.
+let mut options = gif::DecodeOptions::new();
+options.set_color_output(gif::ColorOutput::RGBA);
+// Read the file header
+let mut decoder = options.read_info(input).unwrap();
+while let Some(frame) = decoder.read_next_frame().unwrap() {
+    // Process every frame
+}
+```
+
+### Encoding GIF files
+
+The encoder can be used to save simple computer generated images:
+
+```rust
+use gif::{Frame, Encoder, Repeat};
+use std::fs::File;
+use std::borrow::Cow;
+
+let color_map = &[0xFF, 0xFF, 0xFF, 0, 0, 0];
+let (width, height) = (6, 6);
+let beacon_states = [[
+    0, 0, 0, 0, 0, 0,
+    0, 1, 1, 0, 0, 0,
+    0, 1, 1, 0, 0, 0,
+    0, 0, 0, 1, 1, 0,
+    0, 0, 0, 1, 1, 0,
+    0, 0, 0, 0, 0, 0,
+], [
+    0, 0, 0, 0, 0, 0,
+    0, 1, 1, 0, 0, 0,
+    0, 1, 0, 0, 0, 0,
+    0, 0, 0, 0, 1, 0,
+    0, 0, 0, 1, 1, 0,
+    0, 0, 0, 0, 0, 0,
+]];
+let mut image = File::create("target/beacon.gif").unwrap();
+let mut encoder = Encoder::new(&mut image, width, height, color_map).unwrap();
+encoder.set_repeat(Repeat::Infinite).unwrap();
+for state in &beacon_states {
+    let mut frame = Frame::default();
+    frame.width = width;
+    frame.height = height;
+    frame.buffer = Cow::Borrowed(&*state);
+    encoder.write_frame(&frame).unwrap();
+}
+```
+
+[`Frame::from_*`](https://docs.rs/gif/*/gif/struct.Frame.html) can be used to convert a true color image to a paletted
+image with a maximum of 256 colors:
+
+```rust
+use std::fs::File;
+
+// Get pixel data from some source
+let mut pixels: Vec<u8> = vec![0; 30_000];
+// Create frame from data
+let frame = gif::Frame::from_rgb(100, 100, &mut *pixels);
+// Create encoder
+let mut image = File::create("target/indexed_color.gif").unwrap();
+let mut encoder = gif::Encoder::new(&mut image, frame.width, frame.height, &[]).unwrap();
+// Write frame to file
+encoder.write_frame(&frame).unwrap();
+```