chore: add install docs

website/docs/install.md

@@ -1,3 +1,43 @@
 # Install
 
-TODO
+You can install the pre-compiled binary (in several ways), or compile from source.
+
+## Install using `go install`
+
+You can install with `go install` with:
+
+```bash
+go install github.com/kyverno/kyverno-json@latest
+```
+
+## Manually
+
+```
+Download the pre-compiled binaries from the [releases page](https://github.com/kyverno/kyverno-json/releases) and copy them to the desired location.
+```
+
+## Compile from sources
+
+**clone:**
+
+```bash
+git clone github.com/kyverno/kyverno-json
+```
+
+**get the dependencies:**
+
+```bash
+go mod tidy
+```
+
+**build:**
+
+```bash
+make build
+```
+
+**verify it works:**
+
+```bash
+./kyverno-json version
+```