NEW FEATURE: M365_BUILDER() (Microsoft 365 builder) (#2365)

Co-authored-by: Tom Limoncelli <tlimoncelli@stackoverflow.com>

documentation/functions/record/M365_BUILDER.md

@@ -0,0 +1,70 @@
+---
+name: M365_BUILDER
+parameters:
+  - label
+  - mx
+  - autodiscover
+  - dkim
+  - skypeForBusiness
+  - mdm
+  - domainGUID
+  - initialDomain
+parameters_object: true
+parameter_types:
+  label: string?
+  mx: boolean?
+  autodiscover: boolean?
+  dkim: boolean?
+  skypeForBusiness: boolean?
+  mdm: boolean?
+  domainGUID: string?
+  initialDomain: string?
+---
+
+DNSControl offers a `M365_BUILDER` which can be used to simply set up Microsoft 365 for a domain in an opinionated way.
+
+It defaults to a setup without support for legacy Skype for Business applications.
+It doesn't set up SPF or DMARC. See [`SPF_BUILDER`](/language-reference/record-modifiers/dmarc_builder) and [`DMARC_BUILDER`](/language-reference/record-modifiers/spf_builder).
+
+## Example
+
+### Simple example
+
+{% code title="dnsconfig.js" %}
+```javascript
+M365_BUILDER({
+    initialDomain: 'example.onmicrosoft.com',
+});
+```
+{% endcode %}
+
+This sets up `MX` records, Autodiscover, and DKIM.
+
+### Advanced example
+
+{% code title="dnsconfig.js" %}
+```javascript
+M365_BUILDER({
+    label: 'test',
+    mx: false,
+    autodiscover: false,
+    dkim: false,
+    mdm: true,
+    domainGUID: 'test-example-com', // Can be automatically derived in this case, if example.com is the context.
+    initialDomain: 'example.onmicrosoft.com',
+});
+```
+{% endcode %}
+
+This sets up Mobile Device Management only.
+
+### Parameters
+
+* `label` The label of the Microsoft 365 domain, useful if it is a subdomain (default: `'@'`)
+* `mx` Set an `MX` record? (default: `true`)
+* `autodiscover` Set Autodiscover `CNAME` record? (default: `true`)
+* `dkim` Set DKIM `CNAME` records? (default: `true`)
+* `skypeForBusiness` Set Skype for Business/Microsoft Teams records? (default: `false`)
+* `mdm` Set Mobile Device Management records? (default: `false`)
+* `domainGUID` The GUID of _this_ Microsoft 365 domain (default: `<label>.<context>` with `.` replaced by `-`, no default if domain contains dashes)
+* `initialDomain` The initial domain of your Microsoft 365 tenant/account, ends in `onmicrosoft.com`