add simple create identity flow

shared/src/commonMain/kotlin/su/reya/coop/NostrViewModel.kt

@@ -7,6 +7,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import rust.nostr.sdk.Keys
 import su.reya.coop.storage.SecretStorage
 
 class NostrViewModel(
@@ -16,6 +17,9 @@ class NostrViewModel(
     private val _isConnected = MutableStateFlow(false)
     val isConnected = _isConnected.asStateFlow()
 
+    private val _isCreating = MutableStateFlow(false)
+    val isCreating = _isCreating.asStateFlow()
+
     fun initAndConnect(dbPath: String) {
         // Initialize nostr client
         nostr.init(dbPath)
@@ -32,6 +36,24 @@ class NostrViewModel(
         }
     }
 
+    fun createIdentity(name: String, bio: String, picture: String?) {
+        viewModelScope.launch {
+            try {
+                val keys = Keys.generate()
+                val secret = keys.secretKey().toBech32()
+                // Set loading state
+                _isCreating.value = true
+                // Create identity
+                nostr.createIdentity(keys, name, bio, picture)
+                // Save secret to the secret storage
+                secretStore.set("user_signer", secret)
+            } catch (e: Exception) {
+                _isCreating.value = false
+                println(e)
+            }
+        }
+    }
+
     override fun onCleared() {
         super.onCleared()
         // Ensure all relays are disconnect