Add features and license.

README.md

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 A high performace text editor.
 
 _Hello DIGEdit :rose:, hello world!_
+
+# Background
+When developing my software, I need a colored text component, so DIGEdit was created as a by-product. Hope it is a good by-product.
+
+# Screenshots
+![cpp](https://github.com/kingToolbox/DIGEdit/blob/master/images/screenshots/cpp.png)
+![rfc](https://github.com/kingToolbox/DIGEdit/blob/master/images/screenshots/rfc.png)
+
+# Features
+- Support huge files upto TBytes. (1GB limitation for 0.8)
+- Support very long lines upto GBytes. (100MB limitation for 0.8)
+- Support vscode syntaxes. (Currently only support cpp, python, rfc, and more is coming)
+- Support vscode themes.
+- Configurable fold, pair, indent, outline, complete, mark and so on.
+- Snippet.
+- Word wrap.
+- Hex edit.
+- Column edit.
+- Multilines edit.
+- Search and replace in folders.
+- High performance.
+
+# License
+Free for personal use.