chore: add flatbuffers support

lextwt.fbs

@@ -0,0 +1,95 @@
+namespace lextwt;
+
+table TwtRegistry {
+    preamble:[Comment];
+    twters:[Twter];
+    twts:[Twt];
+}
+
+enum LinkType : byte {
+    Standard = 1,
+    Media,
+    Plain,
+    Naked
+}
+
+enum CodeType : byte {
+    Inline = 1,
+    Block
+}
+
+table Twter {
+    nick:string;
+    uri:string;
+}
+
+table DateTime {
+    timestamp:long;
+    offset:short;
+}
+
+union Elem {
+    Comment,
+    Mention,
+    BangMention,
+    Tag,
+    Subject,
+    Text,
+    LineSeparator,
+    Link,
+    Code,
+}
+
+table Msg {
+    elem:Elem;
+}
+
+table Twt {
+    twter:Twter;
+    created:DateTime;
+    msg:[Msg];
+}
+
+table Comment {
+    comment:string;
+    key:string;
+    value:string;
+}
+
+table Mention {
+    name: string;
+    target:string;
+}
+
+table BangMention {
+    name:string;
+    target:string;
+}
+
+table Tag {
+    tag:string;
+    target:string;
+}
+
+table Subject {
+    subject:string;
+    tag:Tag;
+}
+
+table Text {
+    text:string;
+}
+
+table LineSeparator {}
+
+table Link {
+    type:LinkType = Standard;
+    alt:string;
+    target:string;
+    title:string;
+}
+
+table Code {
+    type:CodeType = Inline;
+    code:string;
+}