Add Hello World example

examples/Hello_World/Hello_World.ino

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+/* The MIT License (MIT)
+ * Copyright (c) 2022 Paperd.Ink
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define PAPERDINK_DEVICE Paperdink_Classic // or Paperdink_Merlot
+#include <Paperdink.h>
+
+PAPERDINK_DEVICE Paperdink;
+
+void setup()
+{
+  /* Initialize device */
+  Paperdink.begin();
+  /* Enable power to display */
+  Paperdink.enable_display();
+
+  /* Print text to  display */
+  GxEPD2_GFX& display = Paperdink.epd;
+  display.setTextColor(GxEPD_WHITE);
+  display.setCursor(50, display.height()/2);
+  display.print("Hello World");
+
+  /* Send data to display for the update */ 
+  Paperdink.epd.display();
+}
+
+void loop() {}

examples/Hello_World/README.md

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+# Hello World
+This example displays "Hello World" in the middle of the screen and is intended as a super simple, minimal example to show how to display text on the screen.
+
+## Usage
+
+Install the Paperd.ink library as explained in the [documentation](https://docs.paperd.ink). Change the `PAPERDINK_DEVICE` on the first line in the example if you have a Merlot Paperd.ink, leave it as is when you have a Classic one. Compile and upload this example to the Paperd.ink device. If everything is successful, the text "Hello World" is displayed in white on a black background.