docs: improve readme (#11)

README.md

@@ -5,12 +5,16 @@ is built using [Upjet](https://github.com/crossplane/upjet) code
 generation tools and exposes XRM-conformant managed resources for the
 OVH API.
 
+## Prerequisites
+
+* Install [up CLI](https://github.com/upbound/up?tab=readme-ov-file#install)
+* Install [Crossplane in your cluster](https://docs.crossplane.io/latest/software/install/)
+
 ## Getting Started
 
-Install the provider by using the following command after changing the image tag
-to the [latest release](https://marketplace.upbound.io/providers/edixos/provider-ovh):
+Install the provider by using the following command:
 ```
-up ctp provider install edixos/provider-ovh:v0.1.0
+up ctp provider install edixos/provider-ovh
 ```
 
 Alternatively, you can use declarative installation:
@@ -21,10 +25,15 @@ kind: Provider
 metadata:
   name: provider-ovh
 spec:
-  package: edixos/provider-ovh:v0.1.0
+  package: edixos/provider-ovh
 EOF
 ```
 
+If you want to specify a version of the provider, add an image tag
+to the [latest release](https://marketplace.upbound.io/providers/edixos/provider-ovh).
+Example:
+`edixos/provider-ovh:v.0.1.4`
+
 Notice that in this example Provider resource is referencing ControllerConfig with debug enabled.
 
 You can see the API reference [here](https://doc.crds.dev/github.com/edixos/provider-ovh).