Add instructions for how to build and run using pixi

Author: emilk

.gitignore

@@ -1,39 +1,5 @@
 # Build directory
-build/
+build
 
-# LSP files
-compile_commands.json
-.cache
-
-# Prerequisites
-*.d
-
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-*.smod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
+# Pixi environment
+.pixi

README.md

@@ -2,15 +2,27 @@
 
 This is a minimal CMake project that shows how to use [Rerun](https://github.com/rerun-io/rerun) in your code in conjunction with [Eigen](https://eigen.tuxfamily.org/) and [OpenCV](https://opencv.org/).
 
-## Depedencies
+## How to build and run
 
-TODO
+### Using `pixi`
+The easiest way to get started is to install [pixi](https://prefix.dev/docs/pixi/overview) and then run: `pixi run run`.
 
-## How to build and run
+### Manually
+
+First install the required dependencies:
+* `arrow-cpp`` (required by Rerun)
+* `eigen` and `opencv` (required by this example)
+* `cmake` and `ninja` (build tools)
+
+Build using:
 
 ```bash
 mkdir build
 cd build
 cmake ..
-cmake --build .
+cmake --build . -- -j8
 ```
+
+Then run the binary with:
+
+`build/rerun_ext_example`