update README with features

integrated some changes from gansai, fixed table syntax

README.md

-Welcome to H2, the Java SQL database.
-=====================================
+# Welcome to H2, the Java SQL database.
 
-The main features of H2 are:
-- Very fast, open source, JDBC API
-- Embedded and server modes; in-memory databases
-- Browser based Console application
-- Small footprint: around 1.5 MB jar file size
+## The main features of H2 are:
 
-More information:
-http://h2database.com
+1. Very fast, open source, JDBC API
+2. Embedded and server modes; in-memory databases
+3. Browser based Console application
+4. Small footprint: around 1.5 MB jar file size
+
+More information: http://h2database.com
+
+## Features
+
+| | [H2](http://www.h2database.com/) | [Derby](http://db.apache.org/derby) | [HSQLDB](http://hsqldb.org) | [MySQL](http://mysql.com) | [PostgreSQL](http://www.postgresql.org) |
+|---------------------------|-------|-------|-------|-------|-------|
+| Pure Java                 | Yes   | Yes   | Yes   | No    | No    |
+| Memory Mode               | Yes   | Yes   | Yes   | No    | No    |
+| Encrypted Database        | Yes   | Yes   | Yes   | No    | No    |
+| ODBC Driver               | Yes   | No    | No    | Yes   | Yes   |
+| Fulltext Search           | Yes   | No    | No    | Yes   | Yes   |
+| Multi Version Concurrency | Yes   | No    | Yes   | Yes   | Yes   |
+| Footprint (jar/dll size)  | ~1 MB | ~2 MB | ~1 MB | ~4 MB | ~6 MB |