view: Add AboutView

This will be used by different views for the user's about section

damus/Views/Profile/AboutView.swift

@@ -0,0 +1,53 @@
+//
+//  AboutView.swift
+//  damus
+//
+//  Created by William Casarin on 2023-06-18.
+//
+
+import SwiftUI
+
+struct AboutView: View {
+    let state: DamusState
+    let about: String
+    let max_about_length = 280
+    @State var show_full_about: Bool = false
+    @State private var about_string: AttributedString? = nil
+    
+    var body: some View {
+        Group {
+            if let about_string {
+                let truncated_about = show_full_about ? about_string : about_string.truncateOrNil(maxLength: max_about_length)
+                SelectableText(attributedString: truncated_about ?? about_string, size: .subheadline)
+
+                if truncated_about != nil {
+                    if show_full_about {
+                        Button(NSLocalizedString("Show less", comment: "Button to show less of a long profile description.")) {
+                            show_full_about = false
+                        }
+                        .font(.footnote)
+                    } else {
+                        Button(NSLocalizedString("Show more", comment: "Button to show more of a long profile description.")) {
+                            show_full_about = true
+                        }
+                        .font(.footnote)
+                    }
+                }
+            } else {
+                Text(verbatim: "")
+                    .font(.subheadline)
+            }
+        }
+        .onAppear {
+            let blocks = parse_mentions(content: about, tags: [])
+            about_string = render_blocks(blocks: blocks, profiles: state.profiles).content.attributed
+        }
+        
+    }
+}
+
+/*
+ #Preview {
+ AboutView()
+ }
+ */