add another README

sketch-up-docs/README.md

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+# CAD programs
+| name       | MegaBytes | description                            |
+| ---------- | --------- | -------------------------------------- |
+| solvespace | 7         |                                        |
+| OpenSCAD   | 21        |                                        |
+| LibreCAD   | 24        |                                        |
+| qcad       | 57        |                                        |
+| BRL-CAD    | 66        |                                        |
+| blender    | 187       |                                        |
+| FreeCAD    | 557       |                                        |