Add installation as well as CI instructions on how to build since we …

…are using mp-units.

.github/workflows/ros2.yml

@@ -30,6 +30,36 @@ jobs:
         ros_distro: [ humble ]
 
     steps:   
+    - name: Install gsl-lite
+      run: |
+        git clone https://github.com/gsl-lite/gsl-lite && cd gsl-lite
+        mkdir build && cd build
+        cmake .. && make -j8
+        sudo make install
+
+    - name: Install Catch2
+      run: |
+        git clone https://github.com/catchorg/Catch2 && cd Catch2
+        mkdir build && cd build
+        cmake .. && make -j8
+        sudo make install
+
+    - name: Install fmt
+      run: |
+        git clone https://github.com/fmtlib/fmt && cd fmt
+        mkdir build && cd build
+        cmake -DFMT_TEST=OFF ..
+        make -j8
+        sudo make install
+
+    - name: Install mp-units
+      run: |
+        git clone https://github.com/mpusz/mp-units && cd mp-units
+        mkdir build && cd build
+        cmake -DMP_UNITS_AS_SYSTEM_HEADERS=ON -DMP_UNITS_BUILD_LA=OFF ..
+        make -j8
+        sudo make install
+
     - uses: ros-tooling/[email protected]
       with:
         required-ros-distributions: ${{ matrix.ros_distro }}

README.md

@@ -7,6 +7,37 @@
 ROS control code for the [T07](https://github.com/107-systems/T07) robot.
 
 #### How-to-build
+* Install `gsl-lite`
+```bash
+git clone https://github.com/gsl-lite/gsl-lite && cd gsl-lite
+mkdir build && cd build
+cmake .. && make -j8
+sudo make install
+```
+* Install `Catch2`
+```bash
+git clone https://github.com/catchorg/Catch2 && cd Catch2
+mkdir build && cd build
+cmake .. && make -j8
+sudo make install
+```
+* Install `fmt`
+```bash
+git clone https://github.com/fmtlib/fmt && cd fmt
+mkdir build && cd build
+cmake -DFMT_TEST=OFF ..
+make -j8
+sudo make install
+```
+* Install `mp-units`
+```bash
+git clone https://github.com/mpusz/mp-units && cd mp-units
+mkdir build && cd build
+cmake -DMP_UNITS_AS_SYSTEM_HEADERS=ON -DMP_UNITS_BUILD_LA=OFF ..
+make -j8
+sudo make install
+```
+* Build with `colcon`
 ```bash
 cd $COLCON_WS/src
 git clone https://github.com/107-systems/t07_ros