Add README.md for webrtc library

gstreamer-webrtc-sys/README.md

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+# gstreamer-webrtc-sys [![crates.io](https://img.shields.io/crates/v/gstreamer-sys.svg)](https://crates.io/crates/gstreamer-sys) [![Build Status](https://travis-ci.org/sdroege/gstreamer-sys.svg?branch=master)](https://travis-ci.org/sdroege/gstreamer-sys)
+
+[GStreamer](https://gstreamer.freedesktop.org/) (WebRTC library) FFI bindings for Rust.
+
+These bindings are providing unsafe FFI API that can be used to interface with
+GStreamer. Generally they are meant to be used as the building block for
+higher-level abstractions like:
+
+  * Application-side bindings for GStreamer: https://github.com/sdroege/gstreamer-rs
+  * Crate for writing GStreamer plugins in Rust: https://github.com/sdroege/gst-plugin-rs
+
+The bindings are autogenerated with [gir](https://github.com/gtk-rs/gir/)
+based on the [GObject-Introspection](https://wiki.gnome.org/Projects/GObjectIntrospection/)
+API metadata provided by the GStreamer project.
+
+## LICENSE
+
+gstreamer-sys and all crates contained here are licensed under the MIT
+license ([LICENSE](LICENSE) or http://opensource.org/licenses/MIT).
+
+GStreamer itself is licensed under the Lesser General Public License version
+2.1 or (at your option) any later version:
+https://www.gnu.org/licenses/lgpl-2.1.html
+
+## Contribution
+
+Any kinds of contributions are welcome as a pull request.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in gstreamer-rs by you shall be licensed under the MIT license as above,
+without any additional terms or conditions.