add gitkeep, add duifei_cal_coarse data

add gitkeep to keep the directory structure

README.md

@@ -146,7 +146,7 @@ The table below outlines the git-friendly Vivado project structure. It is import
 | `ipi-bds`     | The IP Integrator block design source file (.bd), along with IP subdirectory including IP source files and output products. |
 | `testbenches` | Simulation test benches and stimulus files. |
 | `constraints` | All XDC constraint files and Tcl commands used as constraints. |
-| `project`     | Vivado project directory. For single project mode, there is not project subdirectories needed; for multi project mode, each project is stored in a subdirectory containing a single Vivado project. It should be noted that the `.gitignore` is different for single project mode and multi project mode, because the directory depth are not the same. Therefore, `.gitignore` should always be checked before the first commit. |
+| `project`     | Vivado project directory. For single project mode, there is no project subdirectories needed; for multi project mode, each project is stored in a subdirectory containing a single Vivado project. It should be noted that the `.gitignore` is different for single project mode and multi project mode, because the directory depth are not the same. Therefore, `.gitignore` should always be checked before the first commit. |
 | `scripts`     | Run scripts used to compile the design including any pre and post scripts used when launching runs, along with any other custom scripts such as MATLAB scripts. |
 | `docs`        | Any design related documentations, specifications, reports, etc. |
 | `project.tcl` | The script used to recreate the associated Vivado project. |