Update README

Signed-off-by: Chris Frantz <[email protected]>

README.md

@@ -1,2 +1,45 @@
 # bazel-release
 Bazel automated GitHub release process
+
+This repository contains bazel automation for performing releases to GitHub.
+
+## Usage
+
+Load this repository in your `WORKSPACE`:
+
+```
+http_archive(
+    name = "lowrisc_bazel_release",
+    url = "<TODO>",
+    sha256 = "<TODO>",
+    strip_prefix = "<TODO>",
+)
+
+
+load("@lowrisc_bazel_release//:repos.bzl", "lowrisc_bazel_release_repos")
+lowrisc_bazel_release_repos()
+load("//:deps.bzl", "lowrisc_bazel_release_deps")
+lowrisc_bazel_release_deps()
+```
+
+Then, in a `BUILD` file, instantiate the `release` rule:
+
+```
+load("@lowrisc_bazel_release//release:release.bzl", "release")
+
+release(
+    name = "release",
+    artifacts = {
+        "//:your_release_artifact": "Binary release of my project",
+    },
+)
+```
+
+When you want to perform a release, run the `release` target:
+
+```
+bazel run :release -- <your release tag name>
+```
+
+Bazel will build your release artifacts, and then use the GitHub CLI to
+create a release on GitHub and upload your release artifacts.