chore: import upstream snapshot with attribution

examples/ping-pong-api/src/main.0

@@ -0,0 +1,20 @@
+pub fn main(world: World) -> Void raises {
+    check std.http.listen(world)
+}
+
+fn handle(request: Span<u8>, response: MutSpan<u8>) -> Maybe<Span<u8>> {
+    if std.http.requestIsGet(request, "/ping") {
+        return std.http.writeJsonOk(response, "{\"message\":\"pong\"}")
+    }
+    if std.http.requestIsGet(request, "/health") {
+        return std.http.writeJsonOk(response, "{\"ok\":true}")
+    }
+    if std.http.requestIsPost(request, "/echo") {
+        let body: Maybe<Span<u8>> = std.http.requestJsonBodyWithin(request, 128)
+        if body.has {
+            return std.http.writeJsonCreated(response, body.value)
+        }
+        return std.http.writeJsonBadRequest(response, "{\"error\":\"bad_request\"}")
+    }
+    return std.http.writeJsonNotFound(response, "{\"error\":\"not_found\"}")
+}

examples/ping-pong-api/zero.toml

@@ -0,0 +1,19 @@
+[package]
+name = "ping-pong-api"
+version = "0.1.0"
+license = "MIT"
+
+[targets.cli]
+kind = "exe"
+main = "src/main.0"
+defaultTarget = "linux-musl-x64"
+devTarget = "host"
+releaseProfile = "release-small"
+
+[deps]
+
+[profiles.dev]
+inherits = "dev"
+
+[profiles.release-small]
+inherits = "release-small"