Initial data commit

Task/Echo-server/D/echo-server-1.d

@@ -0,0 +1,20 @@
+import std.array, std.socket;
+
+void main() {
+    auto listener = new TcpSocket;
+    assert(listener.isAlive);
+    listener.bind(new InternetAddress(12321));
+    listener.listen(10);
+
+    Socket currSock;
+    uint bytesRead;
+    ubyte[1] buff;
+
+    while (true) {
+        currSock = listener.accept();
+        while ((bytesRead = currSock.receive(buff)) > 0)
+            currSock.send(buff);
+        currSock.close();
+        buff.clear();
+    }
+}