Add basic structure for crypto, state, time (#13)

internal/crypto/constants.go

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+package crypto
+
+const (
+	HashSize           = 32
+	BandersnatchSize   = 32
+	Ed25519PublicSize  = 32
+	Ed25519PrivateSize = 64
+	BLSSize            = 144
+)

internal/crypto/hash.go

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+package crypto
+
+type Hash [HashSize]byte

internal/crypto/keys.go

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+package crypto
+
+import (
+	"crypto/ed25519"
+)
+
+type Ed25519PublicKey ed25519.PublicKey
+type Ed25519PrivateKey ed25519.PrivateKey

internal/state/state.go

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+package state
+
+type State struct {
+}

internal/time/constants.go

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+package time
+
+import "time"
+
+const (
+	TimeslotsPerEpoch = 600
+	TimeslotDuration  = 6 * time.Second
+	EpochDuration     = TimeslotsPerEpoch * TimeslotDuration
+)

internal/time/epoch.go

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+package time
+
+type Epoch uint32

internal/time/timeslot.go

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+package time
+
+type Timeslot uint32