Add cimgui

engine/libs/cimgui/.travis.yml

@@ -0,0 +1,23 @@
+language: cpp
+dist: focal
+
+os:
+  - linux
+  - osx
+  - windows
+
+compiler:
+  - gcc
+  - clang
+
+script:
+  - mkdir bld
+  - cd bld
+  - cmake -D CIMGUI_TEST=1 ..
+  - cmake --build .
+  - |
+    if [ "$TRAVIS_OS_NAME" == "windows" ]; then
+      ./Debug/cimgui_test.exe
+    else
+      ./cimgui_test
+    fi