Add provider installation instructions to README (#535)

README.md

@@ -11,21 +11,21 @@ Requirements
 ------------
 
 -   [Terraform](https://www.terraform.io/downloads.html) 0.12.x+
--   [Go](https://golang.org/doc/install) 1.11 (to build the provider plugin)
+-   [Go](https://golang.org/doc/install) 1.22.x+ (to build the provider plugin)
 
 Building The Provider
 ---------------------
 
 Clone repository to: `$GOPATH/src/github.com/vultr/terraform-provider-vultr`
 
-```sh
+``` sh
 $ mkdir -p $GOPATH/src/github.com/vultr; cd $GOPATH/src/github.com/vultr
 $ git clone [email protected]:vultr/terraform-provider-vultr.git
 ```
 
 Enter the provider directory and build the provider
 
-```sh
+``` sh
 $ cd $GOPATH/src/github.com/vultr/terraform-provider-vultr
 $ make build
 ```
@@ -37,14 +37,77 @@ See the [Vultr Provider documentation](website/docs/index.html.markdown) to get
 
 Please read about [V2 changes from V1](example/V2Changes.md) for a list of new changes made to the Vultr Terraform Provider
 
+### Installation
+In your terraform config, define `vultr/vultr` in your `required_providers` and set your API key:
+``` hcl
+terraform {
+  required_providers {
+    vultr = {
+      source = "vultr/vultr"
+      version = "2.22.1"
+    }
+  }
+}
+
+provider "vultr" {
+    api_key = "..."
+}
+```
+
+After, run `terraform init` to install the provider.
+
+#### Manual Installation
+If you don't have internet access on the target machine or prefer to install
+the provider locally follow the steps for the relevant operating system and architecture. 
+
+1) [Download](https://github.com/vultr/terraform-provider-vultr/releases) and
+extract the binary for your system and architecture
+
+2) Make the local plugins directory:
+
+On linux 
+``` sh
+export VERSION=2.22.1 OS=linux ARCH=amd64 
+mkdir -p ~/.terraform.d/plugins/local/vultr/vultr/${VERSION}/${OS}_${ARCH}/'
+```
+
+On mac
+``` sh
+export VERSION=2.22.1 OS=darwin ARCH=arm64 
+mkdir -p ~/.terraform.d/plugins/local/vultr/vultr/${VERSION}/${OS}_${ARCH}/'
+```
+
+3) Rename and copy the binary into the local plugins directory:
+``` sh
+mv terraform-provider-vultr_v${VERSION} ~/.terraform.d/plugins/local/vultr/vultr/${VERSION}/${OS}_${ARCH}/terraform-provider-vultr_v${VERSION}
+```
+
+4) Add the local provider to your terraform `main.tf` config:
+``` hcl
+terraform {
+  required_providers {
+    vultr = {
+      source = "local/vultr/vultr"
+      version = "2.22.1"
+    }
+  }
+}
+
+provider "vultr" {
+  api_key = "..."
+}
+```
+
+5) Test everything by running `terraform init` in that same directory. 
+
 Developing the Provider
 ---------------------------
 
 If you wish to work on the provider, you'll first need [Go](http://www.golang.org) installed on your machine (version 1.11+ is *required*). You'll also need to correctly setup a [GOPATH](http://golang.org/doc/code.html#GOPATH), as well as adding `$GOPATH/bin` to your `$PATH`.
 
 To compile the provider, run `make build`. This will build the provider and put the provider binary in the `$GOPATH/bin` directory.
 
-```sh
+``` sh
 $ make build
 ...
 $ $GOPATH/bin/terraform-provider-vultr
@@ -53,20 +116,20 @@ $ $GOPATH/bin/terraform-provider-vultr
 
 In order to test the provider, you can simply run `make test`.
 
-```sh
+``` sh
 $ make test
 ```
 
 In order to run the full suite of acceptance tests, run `make testacc`.
 
 *Note:* Acceptance tests create real resources, and often cost money to run.
 
-```sh
+``` sh
 $ make testacc
 ```
 
 In order to run a specific acceptance test, use the `TESTARGS` environment variable. For example, the following command will run `TestAccVultrUser_base` acceptance test only:
 
-```sh
+``` sh
 $ make testacc TESTARGS='-run=TestAccVultrUser_base'
 ```