Inital commit. Meisten features sind implementiert und müssen getestet werden

src/Cache.cpp

@@ -0,0 +1,28 @@
+#include "Cache.h"
+#include <algorithm>
+std::vector<TopicState> Cache::topic_states(std::vector<std::string>& topics) {
+	std::vector<TopicState> states;
+	
+	for (const auto& topic : topics) {
+		auto hit = std::find_if(cache.begin(), cache.end(), [&](TopicState& cache_state) {
+			return cache_state.topic == topic;
+		});
+		if (hit != cache.end()) {
+			states.push_back(*hit);
+		}
+	}
+
+	return states;
+}
+
+TopicState Cache::set_topic_value(const std::string& topic, const std::string& value) {
+	for (auto& state : cache) {
+		if (state.topic == topic) {
+			state.value = value;
+
+			return state;
+		}
+	}
+
+	return cache.emplace_back(topic, value);
+}