add readme

src/main/java/cc/fascinated/piaservers/readme/ReadMeManager.java

@@ -0,0 +1,35 @@
+package cc.fascinated.piaservers.readme;
+
+import cc.fascinated.piaservers.Main;
+import cc.fascinated.piaservers.pia.PiaManager;
+import lombok.SneakyThrows;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+import java.util.Date;
+import java.util.List;
+
+public class ReadMeManager {
+
+    @SneakyThrows
+    public ReadMeManager() {
+        InputStream readmeStream = Main.class.getResourceAsStream("/README.md");
+        if (readmeStream == null) {
+            System.out.println("Failed to find README.md");
+            return;
+        }
+        File readmeFile = new File("README.md");
+        if (!readmeFile.exists()) {
+            readmeFile.createNewFile();
+        }
+
+        String contents = new String(readmeStream.readAllBytes());
+        contents = contents.replace("{server_count}", String.valueOf(PiaManager.SERVERS.size()));
+        contents = contents.replace("{last_update}", new Date().toString().replaceAll(" ", "_"));
+
+        Files.write(readmeFile.toPath(), contents.getBytes());
+    }
+}