added README

.cargo/config.toml

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+[build]
+
+[target.armv7-unknown-linux-gnueabihf]
+linker = "arm-linux-gnueabihf-gcc"

README.md

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+Rust packages for the EIVE project
+======
+
+This repository contains the Rust packages used by the EIVE project.
+
+# Build packages for the EIVE OBC
+
+## `fsays`
+
+```sh
+cd ferris-says
+cargo build -p fsays --target armv7-unknown-linux-gnueabihf --release
+```
+
+## `fortune`
+
+```sh
+cd fortune
+cargo build armv7-unknown-linux-gnueabihf --release
+```
+
+# Prerequisites
+
+1. Install rust on your development machine using `rustup`
+
+   ```sh
+   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+   ```
+
+2. Install standard library for target architecture
+
+   ```sh
+   rustup target add armv7-unknown-linux-gnueabihf
+   ```
+
+3. Install a cross-compile toolchain for the Cortex-A9 target and add it to your path.
+   It is recommended to take the same toolchain used to compile the Q7S primary OBSW.
+   See the [dedicated README](https://egit.irs.uni-stuttgart.de/eive/eive-obsw)
+   for more details and download links.