Add placeholder engine and search

BasicEngine.cpp

@@ -0,0 +1,19 @@
+#include "BasicEngine.hpp"
+
+std::string BasicEngine::name() const {
+    return mName;
+}
+std::string BasicEngine::version() const {
+    return mVersion;
+}
+std::string BasicEngine::author() const {
+    return mAuthor;
+}
+void BasicEngine::newGame() {
+
+}
+PrincipalVariation BasicEngine::pv(const Board &board, const TimeInfo::Optional &timeInfo) {
+    (void)board;
+    (void)timeInfo;
+    return PrincipalVariation();
+}