CMake: add lib skeleton and google-tests

pasada-lib/CMakeLists.txt

@@ -0,0 +1,24 @@
+project(Pasada_Lib)
+
+SET(PASADA_SRC
+        library.cpp
+)
+
+if(PASADA_BUILD_TESTS)
+    # must build a STATIC library for google-tests to successfully consume us
+    # (otherwise, strange runtime errors ensue when trying to call into the lib)
+    add_library(pasada STATIC
+            ${PASADA_SRC}
+    )
+else()
+    add_library(pasada SHARED
+            ${PASADA_SRC}
+    )
+endif()
+
+target_include_directories(pasada
+        PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+set(CMAKE_CXX_STANDARD 20)

pasada-lib/include/library.h

@@ -0,0 +1,6 @@
+#ifndef LIBPASADA_LIBRARY_H
+#define LIBPASADA_LIBRARY_H
+
+void hello();
+
+#endif // LIBPASADA_LIBRARY_H

pasada-lib/library.cpp

@@ -0,0 +1,7 @@
+#include "library.h"
+
+#include <iostream>
+
+void hello() {
+    std::cout << "Hello, World!" << std::endl;
+}