On documentation: Add list of all supported ciphers, modes, hash algorithms, curves and so on

[emilfihlman]

Prerequisites

• [x] Checked the developer manual
• [x] Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=repo%3Alibtom%2Flibtomcrypt

Description

Add a list of all supported ciphers, modes, hash algorithms, curves and so on to the developer manual. For example I don't know if the library supports the NIST curves (like P256/prime256v1).

[sheoran27]

@emilfihlman I am using libtomcrypt in my ongoing project and now I have gone through all the documentation. I am willing to contribute.