add tips easel

docs/Instruction/tips/easel.md

+# Easel (CAM)
+
+## Easel
+
+- [site](https://www.inventables.com/technologies/easel) -> LOG IN TO EASEL
+- 

docs/Instruction/tips_list.md

@@ -25,6 +25,7 @@
 ## CNC
 - [Sainsmart Genmitsu PROVerXL4030](./tips/genmitsu_prover_xl_setup.md)
 - [Wax milling with mods and Genmitsu PROVerXL4030](./tips/wax_milling_mods.md)
+- [easel CAM](./tips/easel.md)
 
 ## JTAG/SWD programming
 - [FA2022 USB-D11C-serial(Mac + ArduinoIDE + Xiao )](./tips/FA2022_usbserial_ArduinoIDE_Xiao.md)