Added the layouts used for DRC ruleset development to sky130/custom/drc/.
diff --git a/sky130/custom/drc/varac.mag b/sky130/custom/drc/varac.mag
new file mode 100644
index 0000000..420b53d
--- /dev/null
+++ b/sky130/custom/drc/varac.mag
@@ -0,0 +1,129 @@
+magic
+tech sky130A
+magscale 1 2
+timestamp 1602989408
+<< error_p >>
+rect 1653 869 1661 964
+rect 1741 869 1757 964
+rect 2554 707 2560 1080
+rect 3737 975 3777 1101
+rect 6208 1032 6325 1076
+rect 7217 1032 7226 1036
+rect 2901 850 2909 945
+rect 2989 850 3005 945
+rect 3737 737 3777 848
+rect 4115 828 4123 923
+rect 4203 828 4219 923
+rect 5299 833 5307 928
+rect 5433 833 5445 972
+rect 7130 897 7138 992
+rect 7218 897 7234 992
+rect 7271 872 7280 1032
+rect 8808 872 8816 967
+rect 8896 872 8912 967
+<< nwell >>
+rect 879 452 1792 1358
+rect 2127 433 3040 1339
+rect 3341 1032 5972 1317
+rect 6674 1032 7747 1317
+rect 3341 411 7747 1032
+rect 8102 411 9058 1317
+<< varactor >>
+rect 1199 726 1306 1099
+rect 2524 707 2554 1080
+rect 3737 901 3777 937
+rect 4433 774 4490 938
+rect 5433 808 5490 972
+rect 6238 821 6295 985
+rect 7417 868 7474 1032
+rect 8289 855 8346 1019
+<< pdiff >>
+rect 8500 843 8621 1029
+<< nsubdiff >>
+rect 1047 726 1199 1099
+rect 1306 726 1450 1099
+rect 1653 964 1749 989
+rect 1653 844 1749 869
+rect 2372 707 2524 1080
+rect 2554 707 2698 1080
+rect 2901 945 2997 970
+rect 3585 901 3737 937
+rect 3777 901 3921 937
+rect 4115 923 4211 948
+rect 7130 992 7226 1036
+rect 2901 825 2997 850
+rect 4115 803 4211 828
+rect 4376 774 4433 938
+rect 4490 774 4572 938
+rect 5299 928 5433 972
+rect 5395 833 5433 928
+rect 5299 808 5433 833
+rect 5490 808 5572 972
+rect 6181 821 6238 985
+rect 6295 821 6377 985
+rect 7130 872 7226 897
+rect 7271 988 7417 1032
+rect 7367 893 7417 988
+rect 7271 868 7417 893
+rect 7474 868 7556 1032
+rect 8223 855 8289 1019
+rect 8346 855 8428 1019
+rect 8808 967 8904 1011
+rect 8808 847 8904 872
+<< nsubdiffcont >>
+rect 1653 869 1749 964
+rect 2901 850 2997 945
+rect 4115 828 4211 923
+rect 5299 833 5395 928
+rect 7130 897 7226 992
+rect 7271 893 7367 988
+rect 8808 872 8904 967
+<< poly >>
+rect 1199 1099 1306 1259
+rect 2524 1080 2554 1240
+rect 1199 566 1306 726
+rect 3737 937 3777 975
+rect 4433 938 4490 999
+rect 5433 972 5490 1033
+rect 6238 985 6295 1046
+rect 7417 1032 7474 1093
+rect 3737 848 3777 901
+rect 8289 1019 8346 1080
+rect 7417 825 7474 868
+rect 4433 731 4490 774
+rect 5433 765 5490 808
+rect 6238 778 6295 821
+rect 8289 812 8346 855
+rect 2524 547 2554 707
+<< locali >>
+rect 7130 992 7226 1036
+rect 1653 964 1749 989
+rect 1653 844 1749 869
+rect 2901 945 2997 970
+rect 2901 825 2997 850
+rect 4115 923 4211 948
+rect 4115 803 4211 828
+rect 5299 928 5395 972
+rect 7130 872 7226 897
+rect 7271 988 7367 1032
+rect 7271 868 7367 893
+rect 8808 967 8904 1011
+rect 8808 847 8904 872
+rect 5299 808 5395 833
+<< labels >>
+flabel comment s 1390 1492 1396 1492 0 FreeSans 560 0 0 0 Incorrect:_flags_poly.5
+flabel comment s 2547 304 2547 304 0 FreeSans 560 0 0 0 varac.1
+flabel comment s 292 2248 292 2248 0 FreeSans 800 0 0 0 Varactor_(varac)
+flabel comment s 3761 282 3761 282 0 FreeSans 560 0 0 0 varac.2
+flabel comment s 1626 2208 1626 2208 0 FreeSans 560 0 0 0 Use_cif_see_NPLUS
+flabel comment s 3202 2218 3202 2218 0 FreeSans 560 0 0 0 Use_cif_see_HVTP
+flabel comment s 4483 311 4483 311 0 FreeSans 560 0 0 0 varac.3
+flabel comment s 5329 297 5329 297 0 FreeSans 560 0 0 0 varac.4
+flabel comment s 6299 283 6299 283 0 FreeSans 560 0 0 0 varac.5
+flabel comment s 7243 309 7243 309 0 FreeSans 560 0 0 0 varac.6
+flabel comment s 8369 315 8369 315 0 FreeSans 560 0 0 0 varac.7
+flabel comment s -23 575 -17 575 0 FreeSans 560 0 0 0 Correct_by_design
+flabel comment s -15 1143 -9 1143 0 FreeSans 560 0 0 0 Not_Implemented
+flabel comment s -112 1013 -112 1013 0 FreeSans 560 0 0 0 varac.8
+flabel comment s 8576 627 8576 627 0 FreeSans 560 0 0 0 (failed?)
+<< end >>
