Add APC NetShelter AR1300 (#3722)

* Create AR1300.yaml

* Fix u_height to 42U

Author: micle546

rack-types/APC/AR1300.yaml

@@ -0,0 +1,18 @@
+---
+manufacturer: APC
+model: AR1300
+slug: apc-ar1300
+form_factor: 4-post-cabinet
+description: APC NetShelter SX, Server Rack Enclosure, 42U, Black, 1991H x 600W x 1070D mm [TAA]
+width: 19
+u_height: 42
+starting_unit: 1
+outer_width: 600
+outer_height: 1991
+outer_depth: 1070
+outer_unit: mm
+mounting_depth: 914.9
+weight: 125.09
+max_weight: 1020.6
+weight_unit: kg
+desc_units: false