chore: improved readme (#42)

* chore: improved readme

* chore: added releases link

Author: ascandone

CONTRIBUTING.md

@@ -0,0 +1,6 @@
+### Develop locally
+
+You can update snaphshots with the
+`UPDATE_SNAPS=true` variable while running the tests
+
+If you need to update the grammar, you can generate the parser using the `generate-parser.sh` script (you'll need to install the antlr4 command first)

README.md

@@ -1,8 +1,12 @@
 # Numscript CLI
 
-[![Go](https://github.com/formancehq/numscript/actions/workflows/checks.yml/badge.svg)](https://github.com/formancehq/numscript/actions/workflows/checks.yml) [![codecov](https://codecov.io/gh/formancehq/numscript/graph/badge.svg?token=njjqGhFQ2p)](https://codecov.io/gh/formancehq/numscript)
+[![GitHub Release](https://img.shields.io/github/v/release/formancehq/numscript)](https://github.com/formancehq/numscript/releases)
+[![Go Reference](https://pkg.go.dev/badge/github.com/formancehq/numscript.svg)](https://pkg.go.dev/github.com/formancehq/numscript)
+[![Go](https://github.com/formancehq/numscript/actions/workflows/checks.yml/badge.svg)](https://github.com/formancehq/numscript/actions/workflows/checks.yml)
+[![codecov](https://codecov.io/gh/formancehq/numscript/graph/badge.svg?token=njjqGhFQ2p)](https://codecov.io/gh/formancehq/numscript)
 
-Numscript is the DSL used to express financial transaction within the [Formance](https://www.formance.com/) ledger
+Numscript is the DSL used to express financial transaction within the [Formance](https://www.formance.com/) ledger.
+You can try it in its [online playground](https://playground.numscript.org)
 
 The CLI in this repo allows you to play with numscript locally, check if there are parsing or logic errors in your numscript files, and run the numscript language server
 
@@ -12,10 +16,3 @@ The language server features include:
 - Hover on values
 - Detect document symbols
 - Go to definition
-
-### Develop locally
-
-You can update snaphshots with the
-`UPDATE_SNAPS=true` variable while running the tests
-
-If you need to update the grammar, you can generate the parser using the `generate-parser.sh` script (you'll need to install the antlr4 command first)