docs: add geolocation, eval and interception examples (#132)

Author: yury-s

README.md

@@ -45,8 +45,7 @@ public class PageScreenshot {
         playwright.firefox()
     );
     for (BrowserType browserType : browserTypes) {
-      Browser browser = browserType.launch(
-          new BrowserType.LaunchOptions().withHeadless(false));
+      Browser browser = browserType.launch();
       BrowserContext context = browser.newContext(
           new Browser.NewContextOptions().withViewport(800, 600));
       Page page = context.newPage();
@@ -59,6 +58,94 @@ public class PageScreenshot {
 }
 ```
 
+#### Mobile and geolocation
+
+This snippet emulates Mobile Chromium on a device at a given geolocation, navigates to openstreetmap.org, performs action and takes a screenshot.
+
+```java
+import com.microsoft.playwright.*;
+import java.nio.file.Paths;
+import static java.util.Arrays.asList;
+
+public class MobileAndGeolocation {
+  public static void main(String[] args) throws Exception {
+    Playwright playwright = Playwright.create();
+    BrowserType browserType = playwright.chromium();
+    Browser browser = browserType.launch();
+    DeviceDescriptor pixel2 = playwright.devices().get("Pixel 2");
+    BrowserContext context = browser.newContext(new Browser.NewContextOptions()
+        .withViewport(pixel2.viewport().width(), pixel2.viewport().height())
+        .withUserAgent(pixel2.userAgent())
+        .withDeviceScaleFactor(pixel2.deviceScaleFactor())
+        .withIsMobile(pixel2.isMobile())
+        .withHasTouch(pixel2.hasTouch())
+        .withLocale("en-US")
+        .withGeolocation(new Geolocation(41.889938, 12.492507))
+        .withPermissions(asList("geolocation")));
+    Page page = context.newPage();
+    page.navigate("https://www.openstreetmap.org/");
+    page.click("a[data-original-title=\"Show My Location\"]");
+    page.screenshot(new Page.ScreenshotOptions().withPath(Paths.get("colosseum-pixel2.png")));
+    browser.close();
+    playwright.close();
+  }
+}
+```
+
+#### Evaluate in browser context
+
+This code snippet navigates to example.com in Firefox, and executes a script in the page context.
+
+```java
+import com.microsoft.playwright.*;
+
+public class EvaluateInBrowserContext {
+  public static void main(String[] args) throws Exception {
+    Playwright playwright = Playwright.create();
+    BrowserType browserType = playwright.firefox();
+    Browser browser = browserType.launch(new BrowserType.LaunchOptions().withHeadless(false));
+    BrowserContext context = browser.newContext();
+    Page page = context.newPage();
+    page.navigate("https://www.example.com/");
+    Object dimensions = page.evaluate("() => {\n" +
+        "  return {\n" +
+        "      width: document.documentElement.clientWidth,\n" +
+        "      height: document.documentElement.clientHeight,\n" +
+        "      deviceScaleFactor: window.devicePixelRatio\n" +
+        "  }\n" +
+        "}");
+    System.out.println(dimensions);
+    browser.close();
+    playwright.close();
+  }
+}
+```
+
+#### Intercept network requests
+
+This code snippet sets up request routing for a WebKit page to log all network requests.
+
+```java
+import com.microsoft.playwright.*;
+
+public class InterceptNetworkRequests {
+  public static void main(String[] args) throws Exception {
+    Playwright playwright = Playwright.create();
+    BrowserType browserType = playwright.webkit();
+    Browser browser = browserType.launch();
+    BrowserContext context = browser.newContext();
+    Page page = context.newPage();
+    page.route("**", route -> {
+      System.out.println(route.request().url());
+      route.continue_();
+    });
+    page.navigate("http://todomvc.com");
+    browser.close();
+    playwright.close();
+  }
+}
+```
+
 ## Notes
 
 Follow [the instructions](https://github.com/microsoft/playwright-java/blob/master/CONTRIBUTING.md#getting-code) to build the project from source and install driver.