Import ESP_UniClock (upstream 1189810)

Vendored from https://github.com/gpeter62/ESP_UniClock: the sketch
source, the web UI and the libraries the ESP8266 build needs, unpacked
from the bundled zips. Adds a PlatformIO project for the ESP-12. The
source is unchanged; local changes follow as separate commits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

firmware/uniclock/lib/NTPClient/examples/Basic/Basic.ino

@@ -0,0 +1,33 @@
+#include <NTPClient.h>
+// change next line to use with another board/shield
+#include <ESP8266WiFi.h>
+//#include <WiFi.h> // for WiFi shield
+//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
+#include <WiFiUdp.h>
+
+const char *ssid     = "<SSID>";
+const char *password = "<PASSWORD>";
+
+WiFiUDP ntpUDP;
+NTPClient timeClient(ntpUDP);
+
+void setup(){
+  Serial.begin(115200);
+
+  WiFi.begin(ssid, password);
+
+  while ( WiFi.status() != WL_CONNECTED ) {
+    delay ( 500 );
+    Serial.print ( "." );
+  }
+
+  timeClient.begin();
+}
+
+void loop() {
+  timeClient.update();
+
+  Serial.println(timeClient.getFormattedTime());
+
+  delay(1000);
+}