add readme and todo file

README

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+pkictl
+======
+
+Pkictl can be used to manage the lifecycle of keys and certificates.
+
+Its main purpose is the creation of certificates and control through rules of the
+certification process. But it can also be used to sign and verify messages based
+on private/public keys.
+
+The focus is on easy commands with clear error messages to make work for the admin
+or user as easy as possible. But it can also be used in scripts to implement
+automated workflows.
+
+features
+--------
+
+The following commnds will be implemented:
+
+* create private key (RSA or ECDSA)
+* create public key based on private key
+* sign a message using a private key
+* verify a message using a public key
+* create a certificate sign request using a private key (WIP)
+* create a certificate using a CSR (not implemented)
+* show information about a CSR/private key/... (not implemented)
+* verify certificate against rules and CSR (not implemented)
+
+Installation
+------------
+
+The project can be built with
+
+    go build
+
+from the main directory. This will create the binary `pkictl`.
+
+Usage
+-----
+
+### print all commands
+
+To print all commands, use
+
+    # ./pkictl
+    Usage: pkictl command args
+    where 'command' is one of:
+        create-private    create a new private key
+        create-public     create a public key from a private one
+        create-cert-sign  create a new certificate sign request
+        help              show this help
+        info              get info on a file
+        sign              sign a certificate request
+        sign-input        sign a message with a private key
+        verify-signature  verify a signature
+
+Print the help for a command:
+
+    ./pkictl create-public --help
+    Usage of create-public:
+      -output="STDOUT": path where the generated public key should be stored
+      -private-key="": path to the private key file
+
+Contributing
+------------
+
+The best way to contribute is to use [github.com/gibheer/pkictl](https://github.com/gibheer/pkictl).

TODO

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+The following list is a collection of areas, where some work is needed
+
+* reduce code size by refactoring
+* make sure that critical files are checked more rigid (filesystem permissions)
+* implement message signing for RSA keys
+* implement certificate generation
+* implement verification of certificates against rules
+* implement verification of certificates against CSRs
+* implement a way to convert keys to SSH format (separate tool?)
+* split project more into lib and CLI?
+* find a way to get ED25519 working
+* implement info command