Add Rust version of sendrecv example

This also comes with a docker image to collect all dependencies and
build everything.

Fixes #20

Author: maxmcd

docker-compose.yml

@@ -0,0 +1,19 @@
+version: '3'
+
+services:
+  # uncomment the sendrecv you would like to use
+  #
+  # sendrecv-gst:
+  #   build: ./sendrecv/gst
+  sendrecv-gst-rust:
+    build: ./sendrecv/gst-rust
+  sendrecv-js:
+    build: ./sendrecv/js
+    ports:
+      - 8080:80
+    depends_on:
+      - signalling
+  signalling:
+    build: ./signalling
+    ports:
+      - 8443:8443

sendrecv/gst-rust/.dockerignore

@@ -0,0 +1 @@
+/target/

sendrecv/gst-rust/.gitignore

@@ -0,0 +1,6 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk