Adds support for a Lit renderer (#665)

* Adds support for a Lit renderer

This adds `@astrojs/renderer-lit`. An experimental Lit renderer.

* Removed cached submodule, mistake

* Prevent globals clobbering

* Add docs on globals

1 files changed, 34 insertions, 0 deletions

diff --git a/examples/framework-lit/src/components/Counter.js b/examples/framework-lit/src/components/Counter.js
new file mode 100644
index 000000000..c901096d5
--- /dev/null
+++ b/examples/framework-lit/src/components/Counter.js
@@ -0,0 +1,34 @@
+import { LitElement, html } from 'lit';
+
+export const tagName = 'my-counter';
+
+class Counter extends LitElement {
+  static get properties() {
+    return {
+      count: {
+        type: Number
+      }
+    };
+  }
+
+  constructor() {
+    super();
+    this.count = 0;
+  }
+
+  increment() {
+    this.count++;
+  }
+
+  render() {
+    return html`
+      <div>
+        <p>Count: ${this.count}</p>
+
+        <button type="button" @click=${this.increment}>Increment</button>
+      </div>
+    `;
+  }
+}
+
+customElements.define(tagName, Counter);
\ No newline at end of file