integrate json-rpc repo

https://github.com/deltachat/deltachat-jsonrpc

deltachat-jsonrpc/README.MD

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+# deltachat-jsonrpc
+
+## Build Requirements
+
+- Linux or Mac, scrips make use of features like `>` pipes and `&&` (maybe the newer versions of powershell support them, but I didn't try that.)
+- rust (installed via rustup)
+
+## Start the webserver
+
+The webserver is an example usage. Goal of it is to be usable both as example and as base for deltachat-kaiOS.
+
+```sh
+RUST_LOG=info cargo run --features webserver
+```
+
+## Generate Typescript Bindings
+
+```sh
+cd typescript
+npm i
+npm run build
+```
+
+## Run the development example
+
+Mac
+
+```sh
+alias firefox=/Applications/Firefox.app/Contents/MacOS/firefox
+npm run example:build && firefox --devtools $(pwd)/example/browser-example.html
+```
+
+Linux:
+
+```sh
+npm run example:run
+```
+
+## Compiling server for kaiOS or android:
+
+```sh
+cross build --features=webserver --target armv7-linux-androideabi --release
+```
+
+## Run the tests
+
+### Rust tests
+
+```
+cargo test --features=webserver
+```
+
+### Typescript
+
+```
+cd typescript
+npm run test
+```
+
+For the online tests to run you need a test account token for a mailadm instance,
+you can use docker to spin up a local instance: https://github.com/deltachat/docker-mailadm
+
+> set the env var `DCC_NEW_TMP_EMAIL` to your mailadm token: example:
+> `DCC_NEW_TMP_EMAIL=https://testrun.org/new_email?t=1h_195dksa6544`
+
+If your test fail with server shutdown at the start, then you might have a process from a last run still running probably and you need to kill that process manually to continue.
+
+#### Test Coverage
+
+You can test coverage with `npm run coverage`, but you need to have `DCC_NEW_TMP_EMAIL` set, otherwise the result will be useless because some functions can only be tested with the online tests.
+
+> If you are offline and want to see the coverage results anyway (even though they are NOT correct), you can bypass the error with `COVERAGE_OFFLINE=1 npm run coverage`
+
+Open `coverage/index.html` for a detailed report.
+`bindings.ts` is probably the most interesting file for coverage, because it describes the api functions.