feat: install examples for top level builds (#233)

This might be useful for distribution packagers to provide example programs in their packages.

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

README.md

@@ -294,6 +294,7 @@ UTF-8 decoding is performed using a state machine based on Bjoern Hoehrmann's '[
 -   **[@rbrugo](https://github.com/rbrugo)** - Helped design a new feature
 -   **[@Reedbeta](https://github.com/Reedbeta)** - Fixed a bug and added additional Visual Studio debugger native visualizers
 -   **[@Ryan-rsm-McKenzie](https://github.com/Ryan-rsm-McKenzie)** - Add natvis file to cmake install script
+-   **[@Scrumplex][https://github.com/Scrumplex)** - Tweaked the build scripts
 -   **[@shdnx](https://github.com/shdnx)** - Fixed a bug on GCC 8.2.0 and some meson config issues
 -   **[@sneves](https://github.com/sneves)** - Helped fix a number of parser bugs
 -   **[@sobczyk](https://github.com/sobczyk)** - Reported some bugs

examples/meson.build

@@ -24,7 +24,8 @@ foreach example : examples
 			[ example + '.cpp' ],
 			cpp_args: example_args,
 			dependencies: tomlplusplus_dep,
-			override_options: global_overrides
+			override_options: global_overrides,
+			install: not is_subproject
 		)
 	]]
 endforeach