Add a table of CLI environment variables

website/source/docs/commands/environment.html.md

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+---
+layout: "docs"
+page_title: "Environment"
+sidebar_current: "docs-commands-environment"
+description: |-
+  Consul's behavior can be modified by certain environment variables.
+---
+
+# Environment variables
+
+The Consul CLI will read the following environment variables to set
+behavioral defaults. These can be overridden in all cases using
+command-line arguments; see the 
+[Consul Commands documentation](https://www.consul.io/docs/commands/index.html)
+for details.
+
+The following table describes these variables:
+
+<table>
+  <tr>
+    <th>Variable name</th>
+    <th>Value</th>
+  </tr>
+  <tr>
+    <td><tt>CONSUL_HTTP_ADDR</tt></td>
+    <td>The HTTP API address as a host:port pair</td>
+  </tr>
+  <tr>
+    <td><tt>CONSUL_HTTP_TOKEN</tt></td>
+    <td>The API access token required when access control lists (ACLs) are enabled</td>
+  </tr>
+  <tr>
+    <td><tt>CONSUL_HTTP_AUTH</tt></td>
+    <td>The HTTP Basic access credentials as a username:password pair</td>
+  </tr>
+  <tr>
+    <td><tt>CONSUL_HTTP_SSL</tt></td>
+    <td>Boolean (default False) to specify HTTPS connections</td>
+  </tr>
+  <tr>
+    <td><tt>CONSUL_HTTP_SSL_VERIFY</tt></td>
+    <td>Boolean (default True) to specify SSL certificate verification</td>
+  </tr>
+  <tr>
+    <td><tt>CONSUL_RPC_ADDR</tt></td>
+    <td>The RPC interface address as a host:port pair</td>
+  </tr>
+</table>