Updated install instructions

Author: Heliozoa

CONTRIBUTING.md

@@ -2,6 +2,16 @@
 
 Install Rust according to https://www.rust-lang.org/tools/install.
 
+```bash
+git clone [email protected]:rage/tmc-langs-rust.git
+cd tmc-langs-rust
+cargo build
+```
+
+If you have any troubles building the project, please do make an issue!
+
+## Testing
+
 Install [zstd 1.5.2](https://github.com/facebook/zstd). For example, on Ubuntu you need the package `libzstd1`. For Windows, download the appropriate archive from the [releases](https://github.com/facebook/zstd/releases), extract it and add the extracted directory to your PATH.
 
 Install [Node.js and npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm).
@@ -12,19 +22,15 @@ Install [OpenJDK 11](https://openjdk.java.net/install/index.html) (other version
 
 Install [.NET 6.0](https://dotnet.microsoft.com/download).
 
-Install [check](https://libcheck.github.io/check/) (works with at least 0.14 and 0.15) and [valgrind](https://valgrind.org/).
+Install [check](https://libcheck.github.io/check/) (works with at least 0.14 and 0.15), [valgrind](https://valgrind.org/) and `libsubunit0` (or equivalent for your distribution).
 
-Install [R](https://www.r-project.org/), [devtools](https://devtools.r-lib.org/) with `install.packages("devtools")` and [tmc-r-tester](https://github.com/testmycode/tmc-rstudio) with `devtools::install_github("testmycode/tmc-r-tester/tmcRtestrunner", build = FALSE)`.
+Install [R](https://www.r-project.org/), [devtools](https://devtools.r-lib.org/) by running `install.packages("devtools")` in `R` and [tmc-r-tester](https://github.com/testmycode/tmc-rstudio) by running `devtools::install_github("testmycode/tmc-r-tester/tmcRtestrunner", build = FALSE)` in `R`. `devtools` has several dependencies that need to be installed. For Ubuntu, they can be installed with
 
 ```bash
-git clone [email protected]:rage/tmc-langs-rust.git
-cd tmc-langs-rust
-cargo build
+sudo apt install libcurl-dev libxml2-dev libopenssl-dev gcc-c++ libharfbuzz-dev libfribidi-dev libfreetype6-dev libpng-dev libtiff5-dev libjpeg-dev
 ```
 
-If you have any troubles building the project, please do make an issue!
-
-## Testing
+With the dependencies instaled, the tests can be run with
 
 ```bash
 cargo test