Update .gitignore and enhance README.md; add new VHDL files for KittCarPWM, ShiftRegisters, and PulseWidthModulator

LAB1/cons/basys3_master.xdc

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+# This file is a general .xdc for the Basys3 rev B board
+# To use it in a project:
+# - uncomment the lines corresponding to used pins
+# - rename the used ports (in each line, after get_ports) according to the top level signal names in the project
+
+# Clock signal
+set_property PACKAGE_PIN W5 [get_ports clk]
+    set_property IOSTANDARD LVCMOS33 [get_ports clk]
+    create_clock -period 10.000 -name sys_clk_pin -waveform {0.000 5.000} -add [get_ports clk]
+    
+# Reset signal
+set_property PACKAGE_PIN U18 [get_ports reset]
+    set_property IOSTANDARD LVCMOS33 [get_ports reset]
+
+# Switches
+set_property PACKAGE_PIN V17 [get_ports {sw[0]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[0]}]
+set_property PACKAGE_PIN V16 [get_ports {sw[1]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[1]}]
+set_property PACKAGE_PIN W16 [get_ports {sw[2]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[2]}]
+set_property PACKAGE_PIN W17 [get_ports {sw[3]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[3]}]
+set_property PACKAGE_PIN W15 [get_ports {sw[4]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[4]}]
+set_property PACKAGE_PIN V15 [get_ports {sw[5]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[5]}]
+set_property PACKAGE_PIN W14 [get_ports {sw[6]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[6]}]
+set_property PACKAGE_PIN W13 [get_ports {sw[7]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[7]}]
+set_property PACKAGE_PIN V2 [get_ports {sw[8]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[8]}]
+set_property PACKAGE_PIN T3 [get_ports {sw[9]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[9]}]
+set_property PACKAGE_PIN T2 [get_ports {sw[10]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[10]}]
+set_property PACKAGE_PIN R3 [get_ports {sw[11]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[11]}]
+set_property PACKAGE_PIN W2 [get_ports {sw[12]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[12]}]
+set_property PACKAGE_PIN U1 [get_ports {sw[13]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[13]}]
+set_property PACKAGE_PIN T1 [get_ports {sw[14]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[14]}]
+set_property PACKAGE_PIN R2 [get_ports {sw[15]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {sw[15]}]
+
+# LEDs
+set_property PACKAGE_PIN U16 [get_ports {led[0]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[0]}]
+set_property PACKAGE_PIN E19 [get_ports {led[1]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[1]}]
+set_property PACKAGE_PIN U19 [get_ports {led[2]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[2]}]
+set_property PACKAGE_PIN V19 [get_ports {led[3]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[3]}]
+set_property PACKAGE_PIN W18 [get_ports {led[4]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[4]}]
+set_property PACKAGE_PIN U15 [get_ports {led[5]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[5]}]
+set_property PACKAGE_PIN U14 [get_ports {led[6]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[6]}]
+set_property PACKAGE_PIN V14 [get_ports {led[7]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[7]}]
+set_property PACKAGE_PIN V13 [get_ports {led[8]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[8]}]
+set_property PACKAGE_PIN V3 [get_ports {led[9]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[9]}]
+set_property PACKAGE_PIN W3 [get_ports {led[10]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[10]}]
+set_property PACKAGE_PIN U3 [get_ports {led[11]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[11]}]
+set_property PACKAGE_PIN P3 [get_ports {led[12]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[12]}]
+set_property PACKAGE_PIN N3 [get_ports {led[13]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[13]}]
+set_property PACKAGE_PIN P1 [get_ports {led[14]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[14]}]
+set_property PACKAGE_PIN L1 [get_ports {led[15]}]
+    set_property IOSTANDARD LVCMOS33 [get_ports {led[15]}]