Add a README.md file to show how non-bazel users how to build

examples/bazel_build/README.md

@@ -0,0 +1,17 @@
+<!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
+# Slint Bazel Build example
+
+This shows how to build a trivial slint application in the bazel build system.
+
+Requires you to have a bazel toolchain setup. 
+
+This example currently does NOT use the copy of slint in this repo; it pulls it in from crates.io.
+
+It also pulls in a mostly hermetic rust toolchain, so expect the build to take considerably longer than the other examples the first time you build.
+
+To run the example, run the following command from any subdirectory of this directory (examples/bazel_build):
+
+```bash
+bazel run //src:slint_bazel_example
+```