feat(library/logic): add basic definitions
feat(library/logic): add basic definitions

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

UlrikBuchholtz/lean,htzh/lean,soonhokong/lean-windows,fgdorais/lean,fpvandoorn/lean,leanprover/lean,rlewis1988/lean,c-cube/lean,leodemoura/lean,avigad/lean,leanprover-community/lean,levnach/lean,leanprover/lean,fpvandoorn/lean,rlewis1988/lean,leodemoura/lean,sp3ctum/lean,soonhokong/lean,c-cube/lean,sp3ctum/lean,fpvandoorn/lean,johoelzl/lean,dselsam/lean,leanprover/lean,Kha/lean,levnach/lean,rlewis1988/lean,leanprover-community/lean,soonhokong/lean-windows,soonhokong/lean-osx,soonhokong/lean-osx,fpvandoorn/lean2,soonhokong/lean-windows,Kha/lean,Kha/lean,c-cube/lean,dselsam/lean,dselsam/lean,rlewis1988/lean,digama0/lean,Kha/lean,digama0/lean,javra/lean,leanprover-community/lean,leanprover/lean,javra/lean,rlewis1988/lean,leanprover/lean,soonhokong/lean-osx,fpvandoorn/lean2,sp3ctum/lean,eigengrau/lean,leanprover/lean,fpvandoorn/lean2,avigad/lean,htzh/lean,eigengrau/lean,leodemoura/lean,soonhokong/lean,eigengrau/lean,sp3ctum/lean,soonhokong/lean,soonhokong/lean,javra/lean,soonhokong/lean-windows,fgdorais/lean,fpvandoorn/lean2,leodemoura/lean,fpvandoorn/lean,dselsam/lean,levnach/lean,c-cube/lean,UlrikBuchholtz/lean,dselsam/lean,johoelzl/lean,johoelzl/lean,fgdorais/lean,levnach/lean,leodemoura/lean,digama0/lean,htzh/lean,rlewis1988/lean,avigad/lean,fpvandoorn/lean,leanprover-community/lean,soonhokong/lean-osx,avigad/lean,UlrikBuchholtz/lean,avigad/lean,eigengrau/lean,soonhokong/lean,digama0/lean,Kha/lean,fpvandoorn/lean,eigengrau/lean,UlrikBuchholtz/lean,avigad/lean,soonhokong/lean-osx,levnach/lean,c-cube/lean,fgdorais/lean,leanprover-community/lean,fgdorais/lean,dselsam/lean,leanprover-community/lean,htzh/lean,fgdorais/lean,johoelzl/lean,UlrikBuchholtz/lean,Kha/lean,javra/lean,digama0/lean,htzh/lean,fpvandoorn/lean2,soonhokong/lean-windows,johoelzl/lean,leodemoura/lean,johoelzl/lean,sp3ctum/lean,digama0/lean,javra/lean