mv go-crypto files to crypto dir

crypto/doc.go

@@ -0,0 +1,48 @@
+/*
+go-crypto is a customized/convenience cryptography package
+for supporting Tendermint.
+
+It wraps select functionality of equivalent functions in the
+Go standard library, for easy usage with our libraries.
+
+Keys:
+
+All key generation functions return an instance of the PrivKey interface
+which implements methods
+
+    AssertIsPrivKeyInner()
+    Bytes() []byte
+    Sign(msg []byte) Signature
+    PubKey() PubKey
+    Equals(PrivKey) bool
+    Wrap() PrivKey
+
+From the above method we can:
+a) Retrieve the public key if needed
+
+    pubKey := key.PubKey()
+
+For example:
+    privKey, err := crypto.GenPrivKeyEd25519()
+    if err != nil {
+	...
+    }
+    pubKey := privKey.PubKey()
+    ...
+    // And then you can use the private and public key
+    doSomething(privKey, pubKey)
+
+
+We also provide hashing wrappers around algorithms:
+
+Sha256
+    sum := crypto.Sha256([]byte("This is Tendermint"))
+    fmt.Printf("%x\n", sum)
+
+Ripemd160
+    sum := crypto.Ripemd160([]byte("This is consensus"))
+    fmt.Printf("%x\n", sum)
+*/
+package crypto
+
+// TODO: Add more docs in here