add mojang api status endpoint

src/main/java/cc/fascinated/model/cache/CachedEndpointStatus.java

@@ -0,0 +1,31 @@
+package cc.fascinated.model.cache;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import lombok.*;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.redis.core.RedisHash;
+
+import java.io.Serializable;
+import java.util.Map;
+
+@AllArgsConstructor @Setter @Getter @ToString
+@RedisHash(value = "mojangEndpointStatus", timeToLive = 60L) // 1 minute (in seconds)
+public final class CachedEndpointStatus implements Serializable {
+
+    /**
+     * The id for this endpoint cache.
+     */
+    @Id @NonNull @JsonIgnore
+    private final String id;
+
+    /**
+     * The list of endpoints and their status.
+     */
+    private final Map<String, Boolean> endpoints;
+
+    /**
+     * The unix timestamp of when this
+     * server was cached, -1 if not cached.
+     */
+    private long cached;
+}