Merge pull request hyperledger-indy#834 from Artemkaaas/feature/nodejs-gsg

NodeJS Gettint-Started Guide

Author: jovfer

.gitignore

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 cargo-registry
 target
 build
+node_modules
 .idea
 *.iml
 .venv

samples/nodejs/README.md

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+# Getting started with the node.js wrapper
+
+* Make sure you have libindy installed. Checkout the guides [here](https://github.com/hyperledger/indy-sdk/tree/master/doc).
+    * On Linux, export the `LD_LIBRARY_PATH` environment variable to point to the `libindy.so` parent directory, or copy libindy.so to `/usr/lib/libindy.so`.
+    * On Mac OS, you must have `libindy.dylib` at `/usr/local/lib/libindy.dylib` before running npm install.
+* Inside `samples/nodejs/`
+    * Make sure you have a running ledger with `npm run ledger`. You must have docker installed.
+    * Then run `npm run build` and `npm start`.
+ 
+### Troubleshooting
+
+* If you get an error on the npm install, make sure that LD\_LIBRARY\_PATH is defined or that the library is in the correct directory. See above.
+* If you get an `CommonInvalidState` indy error, try rebuilding the ledger with the `--no-cache` docker flag.
+* If you just can't figure out why you are getting an indy error, try it with `RUST_LOG=INFO` to see the rust logs.
+
+See documentation for the wrapper at [npmjs.com](https://www.npmjs.com/package/indy-sdk#installing).
+
+### Ready to start consuming indy-sdk?
+This example pulls the wrapper from this repository, but you can download it yourself from the npm registery with `npm i indy-sdk`.