Added icestick and hx8kboard examples

examples/hx8kboard/.gitignore

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+example.bin
+example.blif
+example.txt

examples/hx8kboard/Makefile

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+all: example.bin
+
+example.blif: example.v
+	yosys -p 'synth_ice40 -top top -blif example.blif' example.v
+
+example.txt: example.blif hx8kboard.pcf
+	arachne-pnr -d 8k -o example.txt -p hx8kboard.pcf example.blif
+
+example.bin: example.txt
+	icepack example.txt example.bin
+
+prog:
+	iceprog example.bin
+
+clean:
+	rm -f example.blif example.txt example.bin
+
+.PHONY: all prog clean

examples/hx8kboard/example.v

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+module top (
+	input  clk,
+	output LED0,
+	output LED1,
+	output LED2,
+	output LED3,
+	output LED4,
+	output LED5,
+	output LED6,
+	output LED7
+);
+
+	localparam BITS = 8;
+	localparam LOG2DELAY = 22;
+
+	reg [BITS+LOG2DELAY-1:0] counter = 0;
+	reg [BITS-1:0] outcnt;
+
+	always@(posedge clk) begin
+		counter <= counter + 1;
+		outcnt <= counter >> LOG2DELAY;
+	end
+	
+	assign {LED0, LED1, LED2, LED3, LED4, LED5, LED6, LED7} = outcnt ^ (outcnt >> 1);
+endmodule

examples/hx8kboard/hx8kboard.pcf

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+set_io LED0 B5
+set_io LED1 B4
+set_io LED2 A2
+set_io LED3 A1
+set_io LED4 C5
+set_io LED5 C4
+set_io LED6 B3
+set_io LED7 C3
+set_io clk J3

examples/icestick/.gitignore

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+example.bin
+example.blif
+example.txt

examples/icestick/Makefile

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+all: example.bin
+
+example.blif: example.v
+	yosys -p 'synth_ice40 -top top -blif example.blif' example.v
+
+example.txt: example.blif icestick.pcf
+	arachne-pnr -d 1k -o example.txt -p icestick.pcf example.blif
+
+example.bin: example.txt
+	icepack example.txt example.bin
+
+prog:
+	iceprog example.bin
+
+clean:
+	rm -f example.blif example.txt example.bin
+
+.PHONY: all prog clean

examples/icestick/example.v

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+module top (
+	input  clk,
+	output LED1,
+	output LED2,
+	output LED3,
+	output LED4,
+	output LED5
+);
+
+	localparam BITS = 5;
+	localparam LOG2DELAY = 22;
+
+	reg [BITS+LOG2DELAY-1:0] counter = 0;
+	reg [BITS-1:0] outcnt;
+
+	always@(posedge clk) begin
+		counter <= counter + 1;
+		outcnt <= counter >> LOG2DELAY;
+	end
+	
+	assign {LED1, LED2, LED3, LED4, LED5} = outcnt ^ (outcnt >> 1);
+endmodule

examples/icestick/icestick.pcf

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+set_io LED1 99
+set_io LED2 98
+set_io LED3 97
+set_io LED4 96
+set_io LED5 95
+set_io clk 21