Add a README

LICENSE.md

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+NOTE: The below DOES NOT apply to software in the `vendor/` directory.
+
+Copyright (c) 2019 David Goodlad
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# rtl8710-sdk
+
+Work-in-progress Rust wrapper for the RTL8710 single-chip wifi module [standard
+SDK](https://www.amebaiot.com/en/ameba-sdk-intro/).
+
+The SDK is `v4.0b`, slimmed down to only the parts required to compile. The
+build is, for now, based on
+`project/realtek_ameba1_va0_example/GCC-RELEASE/application.mk` from the SDK,
+implemented as a call out to the `cc` crate in `build.rs`.
+
+## Prerequisites
+
+Requires rust nightly and a couple of `rustup` components:
+
+``` sh
+# Install the nightly toolchain, required for some experimental features
+rustup override set nightly
+
+# Install the rust target for the ARM Cortex-M3 microcontroller
+rustup target add thumbv7m-none-eabi
+
+# Install some required components for the build
+rustup component add llvm-tools-preview
+rustup component add rust-src
+rustup component add rustfmt
+```
+
+## Usage
+
+This is very much WIP, so not easy to describe. The gist looks like this:
+
+1. Make a new binary crate for your project
+2. Add `rtl8710-sdk` as a dependency
+3. Configure cargo to link properly in `.cargo/config`:
+
+    [target.thumbv7m-none-eabi]
+    runner = 'gdb-multiarch'
+    rustflags = [
+      "-C", "linker=arm-none-eabi-ld",
+      "-C", "link-arg=-Tlink.x",
+      "-C", "link-arg=-nostartfiles",
+    ]
+    
+    [build]
+    target = "thumbv7m-none-eabi"
+
+You'll need a linker script (`link.x`) derived from the
+`rlx8195A-symbol-v02-img2.ld` script in the SDK. That's up to you for now.
+
+The resulting binary should be set to load via a debugger (e.g. `gdb` with
+`openocd`). Nothing here prepares it to flash to the device, though!
+
+## License
+
+This work is license under the MIT license. The original SDK software included
+in the `vendor` directory is provided under its respective license(s).