[sw/example] add eclipse project sources

sw/example/eclipse/main.c

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+// Simple Eclipse example project
+
+#include <neorv32.h>
+
+int main() {
+
+  // clear GPIO output (set all bits to 0)
+  neorv32_gpio_port_set(0);
+
+  int cnt = 0;
+
+  while (1) {
+    neorv32_gpio_port_set(cnt++ & 0xFF); // increment counter and mask for lowest 8 bit
+    neorv32_cpu_delay_ms(250); // wait 250ms using busy wait
+  }
+
+  // this should never be reached
+  return 0;
+}

sw/example/eclipse/makefile

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+# Use this makefile to specify all relevant CPU / compiler options
+# as these cannot be issued by Eclipse (since this is a makefile-based project).
+
+# Override the default CPU ISA
+#override MARCH = rv32imc_zicsr_zifencei
+
+# Override the default RISC-V GCC prefix
+RISCV_PREFIX = riscv-none-elf-
+
+# Modify this variable to fit your NEORV32 setup (neorv32 home folder)
+NEORV32_HOME ?= ../../..
+
+# Include the main NEORV32 makefile
+include $(NEORV32_HOME)/sw/common/common.mk