Add initial README

README.md

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+<!--
+SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+
+SPDX-License-Identifier: Apache-2.0
+-->
+# PGPeasy Lemon Squeezy!
+
+PGPeasy is intended to become your next OpenPGP multi-tool.
+It provides an easy interface for all sorts of operations, such as generating and discovering keys, encrypting and decrypting messages, managing certificates...
+
+Contrary to `pgpainless-cli`, this application is not limited to the SOP specification, so it is possible to extend it with additional behavior and more powerful features.
+
+A good example for a feature that will get added at some point is support for password protected keys.
+
+```shell
+$ pgpeasy help
+Usage: pgpeasy [COMMAND]
+Commands:
+  encrypt                   Encrypt a message from standard input
+  decrypt                   Decrypt a message from standard input
+  sign                      Create a detached signature on the data
+                              from standard input
+  verify                    Verify a detached signature over the
+                              data from standard input
+  armor                     Add ASCII Armor to standard input
+  dearmor                   Remove ASCII Armor from standard input
+  extract-cert              Extract a public key certificate from a
+                              secret key from standard input
+  generate-key              Generate a secret key
+  sop                       Stateless OpenPGP Protocol
+  wkd                       Interact with the Web Key Directory
+  vks                       Interact with Verifying Key Servers
+  certificate-store         Store and manage public OpenPGP
+                              certificates
+  wot                       Interact with the Web of Trust
+  help                      Displays help information about the
+                              specified command
+
+```
+
+## Building Instructions
+
+Clone the repository and execute `gradle build` in the project directory.
+Afterwards you can find archives containing the application in the `build/distributions/` directory.
+Once extracted, you can execute the `pgpeasy` script in the `bin` subdirectory.
+