Add gitpod config (#49)

this commit adds support for Gitpod.io, a free automated
dev environment that makes contributing and generally working on GitHub
projects much easier. It allows anyone to start a ready-to-code dev
environment for any branch, issue and pull request with a single click.

Author: mikejing506

.gitpod.Dockerfile

@@ -0,0 +1,12 @@
+FROM gitpod/workspace-full-vnc
+                    
+USER gitpod
+
+# Install custom tools, runtime, etc. using apt-get
+# For example, the command below would install "bastet" - a command line tetris clone:
+#
+# RUN sudo apt-get -q update && #     sudo apt-get install -yq bastet && #     sudo rm -rf /var/lib/apt/lists/*
+#
+# More information: https://www.gitpod.io/docs/config-docker/
+
+sudo apt-get install libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio

.gitpod.yml

@@ -0,0 +1,5 @@
+tasks:
+  - init: go get && go build ./... && go test ./...
+    command: go run
+image:
+  file: .gitpod.Dockerfile

README.md

@@ -1,3 +1,5 @@
+[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/danielpaulus/quicktime_video_hack) 
+
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![CircleCI](https://circleci.com/gh/danielpaulus/quicktime_video_hack.svg?style=svg)](https://circleci.com/gh/danielpaulus/quicktime_video_hack)
 [![codecov](https://codecov.io/gh/danielpaulus/quicktime_video_hack/branch/master/graph/badge.svg)](https://codecov.io/gh/danielpaulus/quicktime_video_hack)