Add a README (just the text from http://keyczar.org, with small tweaks).

README.md

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+Introducing Keyczar
+===================
+
+Keyczar is an open source cryptographic toolkit designed to make it
+easier and safer for developers to use cryptography in their
+applications. Keyczar supports authentication and encryption with both
+symmetric and asymmetric keys. Some features of Keyczar include:
+
+- A simple API
+- Key rotation and versioning
+- Safe default algorithms, modes, and key lengths
+- Automated generation of initialization vectors and ciphertext signatures
+- Java, Python, and C++ implementations
+- International support in Java
+
+Keyczar was originally developed by members of the Google Security
+Team and is released under an Apache 2.0 license.
+
+Quick Links
+-----------
+
+- [Discussion Group](http://groups.google.com/group/keyczar-discuss)
+- [Design Document (PDF)](http://keyczar.googlecode.com/files/keyczar05b.pdf)
+
+Why Keyczar?
+------------
+
+Cryptography is easy to get wrong. Developers can choose improper
+cipher modes, use obsolete algorithms, compose primitives in an unsafe
+manner, or fail to anticipate the need for key rotation. Keyczar
+abstracts some of these details by choosing safe defaults,
+automatically tagging outputs with key version information, and
+providing a simple programming interface.
+
+Keyczar is designed to be open, extensible, and cross-platform
+compatible. It is not intended to replace existing cryptographic
+libraries like OpenSSL, PyCrypto, or the Java JCE, and in fact is
+built on these libraries.
+
+An illustrative use case
+------------------------
+
+Suppose an application needs to encrypt a URL parameter value with a
+symmetric key. Normally, a developer would need to decide which
+algorithm to use, the key length to use, the mode of operation, how to
+handle initialization vectors, how to rotate keys, and how to sign
+ciphertexts. Keyczar simplifies these choices. Using an existing
+keyset, a Java developer would need to call the following:
+
+    Crypter crypter = new Crypter("/path/to/your/keys");
+    String ciphertext = crypter.encrypt("Secret message");
+
+Similarly a Python developer would call the following:
+
+    crypter = Crypter.Read("/path/to/your/keys");
+    ciphertext = crypter.Encrypt("Secret message");
+
+Get involved
+------------
+
+Interested in getting involved? We encourage open source developers to
+contribute to the Keyczar project. Please join us on the Keyczar
+project and subscribe to the Keyczar discussion group.