Added base GOWIN eda script

examples/GW1NSR-4C/.gitignore

@@ -0,0 +1,2 @@
+OUT
+BUILD

examples/GW1NSR-4C/CON/io.cst

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+IO_LOC  "led_o"     10;
+IO_PORT "led_o"     PULL_MODE=NONE DRIVE=8;
+
+IO_LOC  "reset_n_i" 15;
+IO_PORT "reset_n_i" PULL_MODE=UP;
+
+IO_LOC  "clk_i"     45;
+IO_PORT "clk_i"     PULL_MODE=UP;

examples/GW1NSR-4C/CON/io.sdc

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+create_clock -name CLK_IN -period 37.037 -waveform {0 18.52} [get_ports {clk_i}]

examples/GW1NSR-4C/RTL/toplevel.v

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+module led_blink
+(
+    input  clk_i,
+    input  reset_n_i,
+    output led_o
+);
+
+    reg [23:0] counter;
+    reg        polarity;
+
+    always@(posedge clk_i) begin
+        if (!reset_n_i)
+            counter <= 24'h00000;
+        else
+            counter <= counter + 1'b1;
+
+        if (counter == 24'hFFFFF)
+            polarity <= ~polarity;
+    end
+
+    assign led_o = polarity;
+
+endmodule

examples/GW1NSR-4C/project.cfg

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+[project]
+name              = gowin_project
+version           = 0.1
+out_dir           = OUT
+build_dir         = BUILD
+
+[server]
+hostname          = localhost
+port              = 2020
+privkey           = /home/joppe/.ssh/id_rsa
+pubkey            = /home/joppe/.ssh/id_rsa.pub
+
+# ######################################
+# Basic synthesis
+[target.synth]
+toolchain           = gowin
+
+# Toolchain settings
+family              = GW1NSR-4C
+device              = GW1NSR-LV4CQN48PC6/I5
+toplevel            = led_blink
+
+# Fileset
+# files_vhdl        = 
+files_verilog       = RTL/toplevel.v
+files_con           = CON/io.cst
+                      CON/io.sdc
+# ######################################