Disable 'bundled' and 'static-link', add README.md

It turns out that the "static-link" feature flag for the `sdl2-sys`
crate doesn't link `SDL2_Image` nor `SDL2_TTF`) into it, and the
"bundled" feature flag only fetches the main `libsdl2` library at build
time and not `SDL2_Image`. Plus, it seems that "bundled" and
"static-link" are also broken in other ways, at the time of writing:

Rust-SDL2/rust-sdl2#778
Rust-SDL2/rust-sdl2#851
Rust-SDL2/rust-sdl2#858
Rust-SDL2/rust-sdl2#1017
Rust-SDL2/rust-sdl2#1029
Rust-SDL2/rust-sdl2#1034

For the sake of reliability, this commit disables both Cargo feature
flags described for the `sdl2` dependency (thereby requiring the user to
install external dependencies) and introduces a detailed setup guide in
the `README.md` for Windows, macOS, and Linux.

Author: ebkalderon

Cargo.lock

@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0"
 fnv = "1.0"
-sdl2 = { version = "0.34.3", features = ["bundled", "image", "static-link"] }
+sdl2 = { version = "0.34.3", features = ["image"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 uuid = { version = "0.8.2", features = ["serde"] }

Cargo.toml

@@ -0,0 +1,63 @@
+# Disney Streaming Services (DSS) Main Menu
+
+## Getting started
+
+### Prerequisites
+
+To build this project on Windows, macOS, or Linux, you will need a recent stable
+version of the [Rust toolchain](https://www.rust-lang.org/) (this project was
+tested with 1.49.0).
+
+If [`rustup`](https://rustup.rs/) is available on your system, the included 
+[`rust-toolchain`](./rust-toolchain) file at the root directory of this
+repository should automatically fetch and install Rust 1.49 for you, if it's not
+already present on your system, as soon as you run any `cargo` command in your
+shell.
+
+The following external dependencies will also be required on your system:
+
+* [SDL2](https://www.libsdl.org/)
+* `SDL_Image`
+
+#### Windows (MSVC with vcpkg)
+
+```bat
+vcpkg.exe install sdl2:x64-windows sdl2-image:x64-windows
+```
+
+#### macOS
+
+```bash
+brew install sdl2 sdl2_image
+```
+
+#### Linux
+
+```bash
+# Ubuntu/Debian
+sudo apt install -y libsdl2 libsdl2-image
+
+# Arch Linux
+sudo pacman -Sy sdl2 sdl2_image
+```
+
+### Compiling
+
+To compile the application in release mode and start it, simply run this command
+in your terminal:
+
+```bash
+cargo run --release
+```
+
+To execute the included unit test suite, run:
+
+```bash
+cargo test
+```
+
+To generate HTML documentation for the public crate API, run:
+
+```bash
+cargo doc --open
+```