DOCS: Migrated documentation website to Gitbook (#1809)

documentation/providers/azure_dns.md

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+## Configuration
+
+To use this provider, add an entry to `creds.json` with `TYPE` set to `AZURE_DNS`
+along with the API credentials.
+
+Example:
+
+```json
+{
+  "azuredns_main": {
+    "TYPE": "AZURE_DNS",
+    "SubscriptionID": "AZURE_SUBSCRIPTION_ID",
+    "ResourceGroup": "AZURE_RESOURCE_GROUP",
+    "TenantID": "AZURE_TENANT_ID"
+    "ClientID": "AZURE_CLIENT_ID",
+    "ClientSecret": "AZURE_CLIENT_SECRET",
+  }
+}
+```
+
+You can also use environment variables:
+
+```shell
+export AZURE_SUBSCRIPTION_ID=XXXXXXXXX
+export AZURE_RESOURCE_GROUP=YYYYYYYYY
+export AZURE_TENANT_ID=ZZZZZZZZ
+export AZURE_CLIENT_ID=AAAAAAAAA
+export AZURE_CLIENT_SECRET=BBBBBBBBB
+```
+
+```json
+{
+  "azuredns_main": {
+    "TYPE": "AZURE_DNS",
+    "SubscriptionID": "$AZURE_SUBSCRIPTION_ID",
+    "ResourceGroup": "$AZURE_RESOURCE_GROUP",
+    "ClientID": "$AZURE_CLIENT_ID",
+    "TenantID": "$AZURE_TENANT_ID"
+    "ClientSecret": "$AZURE_CLIENT_SECRET",
+  }
+}
+```
+
+## Metadata
+This provider does not recognize any special metadata fields unique to Azure DNS.
+
+## Usage
+An example `dnsconfig.js` configuration:
+
+```javascript
+var REG_NONE = NewRegistrar("none");
+var DSP_AZURE_MAIN = NewDnsProvider("azuredns_main");
+
+D("example.tld", REG_NONE, DnsProvider(DSP_AZURE_MAIN),
+    A("test", "1.2.3.4")
+);
+```
+
+## Activation
+DNSControl depends on a standard [Client credentials Authentication](https://docs.microsoft.com/en-us/cli/azure/create-an-azure-service-principal-azure-cli?view=azure-cli-latest) with permission to list, create and update hosted zones.
+
+## New domains
+If a domain does not exist in your Azure account, DNSControl will *not* automatically add it with the `push` command. You can do that either manually via the control panel, or via the command `dnscontrol create-domains` command.
+
+