Added gitignore and clen script for Gowin IDE projects

gitignores/.gitignore_gowin

@@ -0,0 +1,21 @@
+#------------------------------------------------------------------------------
+# .gitignore for Gowin IDE
+# Konstantin Pavlov, pavlovconst@gmail.com
+#------------------------------------------------------------------------------
+
+# INFO ------------------------------------------------------------------------
+# rename the file to ".gitignore" and place into your Gowin project directory
+#
+
+
+# junk files
+*.gprj.user
+impl/gwsynthesis/*.html
+impl/gwsynthesis/*.xml
+impl/gwsynthesis/*.log
+impl/gwsynthesis/*.vg
+
+# junk directories
+/impl/pnr
+/impl/temp
+

gitignores/.gitignore_modelsim

@@ -1,5 +1,6 @@
 #------------------------------------------------------------------------------
 # .gitignore for Mentor Modelsim
+# published as part of https://github.com/pConst/basic_verilog
 # Konstantin Pavlov, pavlovconst@gmail.com
 #------------------------------------------------------------------------------
 

gitignores/.gitignore_quartus

@@ -1,5 +1,6 @@
 #------------------------------------------------------------------------------
 # .gitignore for Intel Quartus
+# published as part of https://github.com/pConst/basic_verilog
 # Konstantin Pavlov, pavlovconst@gmail.com
 #------------------------------------------------------------------------------
 

gitignores/.gitignore_vivado

@@ -1,5 +1,6 @@
 #------------------------------------------------------------------------------
 # .gitignore for Xilinx Vivado
+# published as part of https://github.com/pConst/basic_verilog
 # Konstantin Pavlov, pavlovconst@gmail.com
 #------------------------------------------------------------------------------
 

scripts/clean_gowin.bat

@@ -0,0 +1,28 @@
+@echo off
+rem ------------------------------------------------------------------------------
+rem  clean_gowin.bat
+rem  published as part of https://github.com/pConst/basic_verilog
+rem  Konstantin Pavlov, pavlovconst@gmail.com
+rem ------------------------------------------------------------------------------
+
+rem   Use this file as a boilerplate for your custom clean script
+rem   for Gowin IDE projects
+
+
+rem preserving .\impl\gwsynthesis\test.prj file
+del /s /f /q .\impl\gwsynthesis\*.html
+del /s /f /q .\impl\gwsynthesis\*.xml
+del /s /f /q .\impl\gwsynthesis\*.log
+del /s /f /q .\impl\gwsynthesis\*.vg
+
+del /s /f /q .\impl\pnr\*
+rmdir /s /q  .\impl\pnr\
+
+del /s /f /q .\impl\temp\*
+rmdir /s /q  .\impl\temp\
+
+del /s /f /q .*.gprj.user
+
+pause
+goto :eof
+