Create second_lab_checklist.md

docs/checklist/second_lab_checklist.md

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+## First Lab CheckList
+[x] `---06/02/2020  drafted by Yimian Liu`   
+
+## Task 
+
+### compulsory
+
+[] Learn Git `Y Song, W Wen`   
+[] Learn Altium `W Wen`   
+[] Learn Latex `Y Song`
+[] List PCB Design pricinples on Blog `B Yang`   
+[] Try PCB Design `B Yang`
+[] Teach Git & Altium `B Yang`
+[] 
+[x] Finish the circuit except the BPF and impedance `B Yang`   
+[] Simulate to get the BPF band range `B Yang, Y Liu`   
+[] Design BPF and insert to circuit `Y Liu`   
+
+--------------
+
+### optional
+
+[] Simulate the circuit and evaluate the result `Y Liu`   
+[x] Design the circuit to be 50ohms `W Wen`   
+[] Simulate the circuit `W Wen`   
+[x] check and order the components we need `Y Liu`