Enhance libvirt module docs to cover libvirt installation and fix mac…

… plugin setup

provider/libvirt/README.md

@@ -6,14 +6,21 @@ This module integrates the libvirt provider with hobby-kube.
 ## Prerequisites
 
 First of all, a working KVM / QEMU host with bridged networking is needed.
-The module works both when provisioned from the virtualization host as well as on a machine with `qemu+ssh`-access to a host machine.
+The module works both when provisioned from the virtualization host as well as on a machine with proper `qemu+ssh`-access to a host machine.
 Some installations have to be made **on the machine that is used for Terraform provisioning**:
 
+* libvirt
 * terraform-provider-libvirt
 * mkisofs
 
 ### Linux
 
+[Libvirt](https://libvirt.org/) needs to be installed to communicate with the Linux virtualization host, if the provisioning machine is not the host as well. 
+On Ubuntu this can be done with
+```
+sudo apt-get install libvirt-clients
+```
+
 [Download a suitable terraform-provider-libvirt release](https://github.com/dmacvicar/terraform-provider-libvirt/releases) and extract the binary.
 Once the binary is extracted, it can be placed in the user's Terraform plugins cache:
 
@@ -34,15 +41,21 @@ sudo apt install genisoimage
 
 ### MacOS
 
+[Libvirt](https://libvirt.org/) needs to be installed to communicate with the Linux virtualization host. 
+This can be done with Homebrew:
+```
+brew install libvirt
+```
+
 There is no pre-compiled binary for terraform-provider-libvirt for MacOS.
 Instead, it can be [built from source](https://github.com/dmacvicar/terraform-provider-libvirt#building-from-source).
 
-Similar to Linux, the resulting binary needs to be placed in the user's terraform plugin cache directory:
+Similar to Linux, the resulting binary needs to be placed in the [user's terraform plugin cache directory](https://www.terraform.io/docs/commands/cli-config.html#provider-installation):
 
 ```
 export TERRAFORM_LIBVIRT_VERSION="0.6.2"
-mkdir -p ~/.local/share/terraform/plugins/registry.terraform.io/dmacvicar/libvirt/$TERRAFORM_LIBVIRT_VERSION/darwin_amd64
-cp terraform-provider-libvirt ~/.local/share/terraform/plugins/registry.terraform.io/dmacvicar/libvirt/$TERRAFORM_LIBVIRT_VERSION/darwin_amd64
+mkdir -p ~/Library/Application\ Support/io.terraform/plugins/registry.terraform.io/dmacvicar/libvirt/$TERRAFORM_LIBVIRT_VERSION/darwin_amd64
+cp terraform-provider-libvirt ~/Library/Application\ Support/io.terraform/plugins/registry.terraform.io/dmacvicar/libvirt/$TERRAFORM_LIBVIRT_VERSION/darwin_amd64
 ```
 
 `mkisofs` is also needed.
@@ -57,7 +70,7 @@ brew install cdrtools
 Uncomment the libvirt-provider module in the top-level `main.tf` file.
 Configure your desired setup in `terraform.tfvars`.
 
-See provided `terraform.tfvars.example` for possible options and explanations.
+See the provided `terraform.tfvars.example` file in the module directory for possible options and explanations.
 
 ### Network Setup