feat: Add public key (#183)

manager/sshkey/src/androidMain/kotlin/io/spherelabs/sshkey/PublicKey.android.kt

@@ -0,0 +1,7 @@
+package io.spherelabs.sshkey
+
+import java.security.PublicKey as JavaPublicKey
+
+actual class PublicKey(var publicKey: JavaPublicKey) {
+    actual val encoded: ByteArray = publicKey.encoded
+}

manager/sshkey/src/commonMain/kotlin/io/spherelabs/sshkey/PublicKey.kt

@@ -0,0 +1,5 @@
+package io.spherelabs.sshkey
+
+expect class PublicKey {
+    val encoded: ByteArray
+}

manager/sshkey/src/iosMain/kotlin/io/spherelabs/sshkey/PublicKey.ios.kt

@@ -0,0 +1,5 @@
+package io.spherelabs.sshkey
+
+actual class PublicKey {
+    actual val encoded: ByteArray = byteArrayOf()
+}