Improve README

README

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 ldnssec-utils
 =============
 
-Lucas' DNSSEC utils, built around LDNS[0].
+Lucas' DNSSEC utils, built around LDNS[0]. Idea of the project is to
+learn a bit more of stuff about LDNS and DNSSEC, and provide a more
+UNIX-y approach to some of the example LDNS utilities.
 
 [0]: https://nlnetlabs.nl/projects/ldns/about/
+
+Requirements
+------------
+
+- C99 compiler
+- make
+- LDNS 1.7.1 or newer
+
+Components
+----------
+
+- ldnssec-keygen: generate DNSSEC private keys, consume them to generate
+  DNSKEY and DS records
+- ldnssec-sign-dnskey: sign the DNSKEY records from a zone
+
+Future directions
+-----------------
+
+- Sign whole zones
+- ZONEMD support
+- Signer daemon