Add 2 examples

examples/using_controller.rs

@@ -0,0 +1,33 @@
+use bat::{
+    assets::HighlightingAssets,
+    controller::Controller,
+    inputfile::InputFile,
+    style::{OutputComponent, OutputComponents},
+    Config,
+};
+use std::collections::HashSet;
+
+fn main() {
+    let assets = HighlightingAssets::new();
+    let mut config = Config {
+        term_width: 100, // must be greater than 13 to enable style=numbers
+        colored_output: true,
+        true_color: true,
+        output_components: OutputComponents(with_header()),
+        ..Default::default()
+    };
+    let mut add_file = |file: &'static str| config.files.push(InputFile::Ordinary(file));
+
+    add_file("Cargo.toml");
+    // add_file("build.rs");
+
+    let print = || Controller::new(&config, &assets).run();
+    print().expect("no error");
+}
+
+fn with_header() -> HashSet<OutputComponent> {
+    [OutputComponent::Header, OutputComponent::Grid]
+        .iter()
+        .cloned()
+        .collect()
+}