add deltachat-rpc-server/README.md

deltachat-rpc-server/README.md

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+# Delta Chat RPC server
+
+This program provides a [JSON-RPC 2.0](https://www.jsonrpc.org/specification) interface to DeltaChat
+over standard I/O.
+
+## Install
+
+To install run:
+
+```sh
+cargo install --path ../deltachat-rpc-server
+```
+
+The `deltachat-rpc-server` executable will be installed into `$HOME/.cargo/bin` that should be available
+in your `PATH`.
+
+## Usage
+
+To use just run `deltachat-rpc-server` command. The accounts folder will be created in the current
+working directory unless `DC_ACCOUNTS_PATH` is set:
+
+```sh
+export DC_ACCOUNTS_PATH=$HOME/delta/
+deltachat-rpc-server
+```
+
+The common use case for this program is to create bindings to use Delta Chat core from programming
+languages other than Rust, for example:
+
+1. Python: https://github.com/deltachat/deltachat-core-rust/tree/master/deltachat-rpc-client/
+2. Go: https://github.com/deltachat/deltachat-rpc-client-go/