Implemented spdlog library example (#150)

examples/spdlog/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMSpdlogExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+        NAME spdlog
+        GITHUB_REPOSITORY gabime/spdlog
+        VERSION 1.7.0
+)
+
+# ---- Executable ----
+
+add_executable(CPMSpdlogExample "main.cpp")
+set_target_properties(CPMSpdlogExample PROPERTIES CXX_STANDARD 17)
+target_link_libraries(CPMSpdlogExample spdlog)

examples/spdlog/main.cpp

@@ -0,0 +1,6 @@
+#include <spdlog/spdlog.h>
+
+int main() {
+  spdlog::info("Hello, world!");
+  return 0;
+}