Update documentation

Author: jdchoi77

docs/EnglishTokenizer.md

@@ -32,4 +32,18 @@ Output:
 [('Emory', (0, 5)), ('NLP', (6, 9)), ('is', (10, 12)), ('a', (13, 14)), ('research', (15, 23)), ('lab', (24, 27)), ('in', (28, 30)), ('Atlanta', (31, 38)), (',', (38, 39)), ('GA', (40, 42)), ('.', (42, 43))]
 [('It', (44, 46)), ('is', (47, 49)), ('founded', (50, 57)), ('by', (58, 60)), ('Jinho', (61, 66)), ('D.', (67, 69)), ('Choi', (70, 74)), ('in', (75, 77)), ('2014', (78, 82)), ('.', (82, 83))]
 [('Dr.', (84, 87)), ('Choi', (88, 92)), ('is', (93, 95)), ('a', (96, 97)), ('professor', (98, 107)), ('at', (108, 110)), ('Emory', (111, 116)), ('University', (117, 127)), ('.', (127, 128))]
-```
+```
+
+## Key Features
+
+| Feature | Input Text | Tokens |
+|---------|------------|--------|
+| Email addresses | `Email (support@elit.cloud)`                    | [`Email`, `(`, `support@elit.cloud`, `)`] |
+| Hyperlinks      | `URL: https://elit.cloud`                       | [`URL`, `:`, `https://elit.cloud`] |
+| Emoticons       | `I love ELIT :-)!?.`                            | [`I`, `love`, `ELIT`, `:-)`, `!?.`] |
+| Hashtags        | `ELIT is the #1 platform #elit2018.`            | [`ELIT`, `is`, `the`, `#`, `1`, `platform`, `#elit2018`, `.`] |
+| HTML entities   | `A←B`                                      | [`A`, `←`, `B`] |
+| Hyphens         | `(123) 456-7890, 123-456-7890, 2014-2018`       | [`(123)`, `456-7890`, `,`, `123-456-7890`, `,`, `2014`, `-`, `2018`] |
+| List items      | `(A)First (A.1)Second [2a]Third [Forth]`        | [`(A)`, `First`, `(A.1)`, `Second`, `[2a]`, `Third`, `[`, `Forth`, `]`] |
+| Units           | `$1,000 20mg 100cm 11:00a.m. 10:30PM`           | [`$`, `1,000`, `20`, `mg`, `100`, `cm`, `11:00`, `a.m.`, `10:30`, `PM`] |
+| Acronyms        | `I'm gonna miss Dr. Choi 'cause he isn't here.` | [`I`, `'m`, `gon`, `na`, `miss`, `Dr.`, `Choi`, `'cause`, `he`, `is`, `n't`, `here`, `.`] |