Add README

README.md

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+xsens-packet-send
+=================
+
+Since XSENS software is stupidly expensive and restrictive, we've written this piece of software to send 
+network packets to Unreal Engine. It cuts out the need for running MVN Animate Pro (which costs thousands 
+of dollars a year).
+
+Windows installation
+--------------------
+
+1. [Install the Rust programming language compiler](https://www.rust-lang.org/tools/install).
+   On Windows, you'll probably want 64-bit for modern machines.
+
+2. The Rust compiler will need Microsoft's C++ compiler and linker.
+   [This Microsoft guide](https://docs.microsoft.com/en-us/windows/dev-environment/rust/setup) explains how
+   to install support along with Visual Studio.
+
+Running the program on Windows
+------------------------------
+
+1. Open `cmd` (command line) or `PowerShell.exe`. 
+
+2. Use `cd` ("change directory") to find the location of the program. 
+   `dir` can be used to see the current directory contents.
+
+3. Type `cargo run` to run the program in debug mode (fast compile, slow execution). 
+   Ctrl-C will kill the program without needing to close the terminal.
+
+4. Type `cargo build --release` to build a production `.exe` binary file that will run
+   six times faster. The exe file will be under the subdirectory `target/release/`.
+