inspiron 14 5420: initial

dell/inspiron/14-5420/README.md

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+# Dell Inspiron 14 5420
+
+### Hardware
+- CPU: Intel® Core™ i7-1260P Processor
+- GPU: Intel® Iris® Xe Graphics
+
+### Other Info
+`fwupd` is used to receive firmware updates from vendors. This device is in its [supported devices list](https://fwupd.org/lvfs/devices/)
+
+`thermald` and `tlp` are used to achieve better battery life and better thermal behaviour

dell/inspiron/14-5420/default.nix

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+{ lib, ... }:
+	
+{
+	imports	= [
+		../../../common/cpu/intel
+		../../../common/pc/laptop
+		../../../common/pc/ssd
+	];
+
+	hardware = {
+		enableRedistributableFirmware = lib.mkDefault true;
+	};
+
+	services = {
+		fwupd =	{
+			enable = lib.mkDefault true;
+		};
+		thermald = {
+			enable = lib.mkDefault true;
+		};
+		tlp	= {
+			enable = lib.mkDefault true;
+		};
+	};
+}