Chore: main page documentation (#355)

examples/provider/provider.tf

@@ -1,4 +1,16 @@
+# Terraform 0.13+ uses the Terraform Registry:
+
+terraform {
+  required_providers {
+    env0 = {
+      source = "env0/env0"
+    }
+  }
+}
+
+# Configure the env0 provider
+
 provider "env0" {
-  api_key    = var.env0_api_key    # or use ENV0_API_KEY
-  api_secret = var.env0_api_secret # or use ENV0_API_SECRET
+  api_key    = var.env0_api_key
+  api_secret = var.env0_api_secret
 }

templates/index.md.tmpl

@@ -0,0 +1,18 @@
+---
+layout: ""
+page_title: "Provider: env0"
+description: |-
+  The env0 provider allows you to interact with the env0 API.
+---
+
+# env0 Provider
+
+The [env0][https://www.env0.com] provider is used to interact with the resources supported by env0. The provider needs to be configured with proper credentials before it can be used. Please refer tho [this guide](https://developer.env0.com/docs/api/YXBpOjY4Njc2-env0-api#creating-an-api-key) on how to generate those credentials.
+
+Use the navigation to the left to read about the available resources.
+
+## Example Usage
+
+{{tffile "examples/provider/provider.tf"}}
+
+{{ .SchemaMarkdown | trimspace }}