added new entries

games/simulation/_toc.md

@@ -25,6 +25,7 @@
 - **[OpenTTD](open_ttd.md)** (C++, GPL-2.0, mature)
 - **[Our Personal Space](our_personal_space.md)** (Ren'py, GPL-3.0, mature)
 - **[Pioneer](pioneer.md)** (C++, C, Apache-2.0, GPL-3.0, mature)
+- **[Rigs of Rods](rigs_of_rods.md)** (C++, GPL-3.0, mature)
 - **[SimuTrans](simutrans.md)** (C++, Artistic License, mature)
 - **[micropolisJS](micropolis_js.md)** (C++, Java, Python, GPL-3.0, mature)
 

games/simulation/open_skyscraper.md

@@ -11,3 +11,4 @@ _Tower simulation game inspired by SimTower._
 
 ## Building
 
+- Build system: CMake

games/simulation/rigs_of_rods.md

@@ -0,0 +1,16 @@
+# Rigs of Rods
+
+_3D simulator game where you can drive, fly and sail various vehicles._
+
+- Home: https://www.rigsofrods.org/, https://sourceforge.net/projects/rigsofrods/, https://github.com/RigsOfRods
+- State: mature 
+- Download: (see homepage)
+- Platform: Windows
+- Keywords: drive
+- Code repository: https://github.com/RigsOfRods/rigs-of-rods.git
+- Code language: C++
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: CMake