Add some basic docs for the registry (#41)

* Initial Pass at docs

Co-authored-by: Matthias Bartelmeß <mba@fourplusone.de>

website/docs/index.html.markdown

@@ -0,0 +1,40 @@
+---
+layout: "jira"
+page_title: "Provider: Jira"
+description: |-
+  The Jira provider provides resources to interact with and manage Jira.
+---
+
+# Jira Provider
+
+The Jira provider provides resources to interact with and manage Jira projects.
+
+## Example Usage
+
+Terraform 0.13 and later:
+
+```terraform
+terraform {
+  required_providers {
+    jira = {
+      source = "fourplusone/jira"
+      version = "0.1.15"
+    }
+  }
+}
+
+# Configure the Jira Provider
+provider "jira" {
+  url      = "https://myjira.atlassian.net" # Can also be set using the JIRA_URL environment variable
+  user     = "xxxx"                         # Can also be set using the JIRA_USER environment variable
+  password = "xxxx"                         # Can also be set using the JIRA_PASSWORD environment variable
+}
+```
+
+## Schema
+
+- **url** (String, Required) URL for your Jira instance. Can be specified with the JIRA_URL environment variable.
+
+- **user** (String, Required) Username for your user. Can be specified with the JIRA_USER environment variable.
+
+- **password** (String, Required) Password for the user, can also be an API Token. Can be specified with the JIRA_PASSWORD environment variable.