Update Essentials.txt

OverClocking/Essentials.txt

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+Check what is your actual stable stock clock <br/>
+vcgencmd measure_clock arm <br/>
+Check temps on stock heatsink or with fan <br/>
+vcgencmd measure_temp <br/>
+
+If temps are under 50 degrees C then step up a notch <br/>
+sudo nano /boot/config.txt <br/>
+Paste after the first line <br/>
+over_voltage=2
+arm_freq=1750
+
+Check temps again <br/>
+vcgencmd measure_temp or watch -n 2 vcgencmd measure_temp <br/>
+
+If temps stay under 50 then you can step up to 2.0 Ghz <br/>
+over_voltage=5
+arm_freq=2000
+
+Be sure to use a power delivery brick and not the shipped one as it will not be able to deliver correct amperes and volrages. <br/>
+
+Never let your Raspberry Pi 4 run at high temps as it will reduce the life. <br/>
+