Add nextpnr-xilinx sections and pages

diff --git a/HDL_workflow.mdwn b/HDL_workflow.mdwn
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@@ -592,6 +592,14 @@ Needed for the Arty A7 100t Digilent FPGA board.
 See [[HDL_workflow/symbiflow]] for installation instructions
 and dependencies.
 
+## Nextpnr-xilinx
+
+An open source place and route framework for Xilinx FPGAs using Project Xray. We will use it for Xilinx 7-series FPGAs like Artix-7.
+
+Needed for Arty A7 100t Digilent FPGA board.
+
+See [[HDL_workflow/nextpnr-xilinx]] for installation instructions and dependencies.
+
 # Registering for git repository access<a name="gitolite3_access"></a>
 
 After going through the onboarding process and having agreed to take

diff --git a/HDL_workflow/nextpnr-xilinx.mdwn b/HDL_workflow/nextpnr-xilinx.mdwn
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+# Installation instructions for Nextpnr-xilinx with Xilinx Artix7 100T Board
+
+* <https://github.com/gatecat/nextpnr-xilinx>
+
+## Bugzilla page
+
+* <https://bugs.libre-soc.org/show_bug.cgi?id=790>
+
+## Page under work