docs: add example instances and changelog

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Revision history for sift
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

examples/coloring-petersen3.cnf

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+c Petersen graph 3-coloring, SAT
+p cnf 30 85
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examples/php43.cnf

@@ -0,0 +1,24 @@
+c pigeonhole PHP(4,3): 4 pigeons, 3 holes, UNSAT
+p cnf 12 22
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examples/php65.cnf

@@ -0,0 +1,83 @@
+c pigeonhole PHP(6,5), UNSAT
+p cnf 30 81
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examples/queens8.cnf

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+c 8-queens placement, SAT
+p cnf 64 736
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examples/sat.cnf

@@ -0,0 +1,7 @@
+c sample satisfiable formula
+c (x1 or x2 or -x3) and (-x1 or x3) and (-x2 or x3) and (x1 or x2)
+p cnf 3 4
+1 2 -3 0
+-1 3 0
+-2 3 0
+1 2 0

examples/unsat.cnf

@@ -0,0 +1,5 @@
+c sample unsatisfiable formula
+c (x1) and (-x1)
+p cnf 1 2
+1 0
+-1 0