Updated readme (#15)

* updated readme

* added instructions for smplx installation

Author: aritkulova

README.md

@@ -1,3 +1,74 @@
 # SimplicityHL Standard Library
 
 This repository contains the standard library for [SimplicityHL](https://github.com/BlockstreamResearch/SimplicityHL).
+
+## Dev Info
+### Installation
+
+> Project currently uses Simplex version 0.0.6.
+
+To compile the project, execute the following command:
+
+```bash
+cargo build
+```
+
+To download simplexup, run:
+
+```bash
+curl -L https://smplx.simplicity-lang.org | bash
+```
+
+To install a specific Simplex version (in this case the v0.0.6 version):
+
+```bash
+simplexup --install v0.0.6
+```
+
+### Compilation
+
+To compile the contracts, execute the following command:
+
+```bash
+simplex build
+```
+
+To clean up generated artifacts:
+
+```bash
+simplex clean
+```
+
+### Test
+
+To run the tests with logs (`-v` or `-vv` is available), execute the following command:
+
+```bash
+simplex test -v
+```
+
+To run the tests using multiple threads:
+
+```bash
+simplex test --test-threads 8
+```
+
+To run a specific test:
+
+```bash
+simplex test test_name
+```
+
+### Linting
+
+To format the rust files, execute the following command:
+
+```bash
+cargo fmt
+```
+
+To check the project for common mistakes:
+
+```bash
+cargo clippy --workspace --all-targets --all-features -- -D warnings
+```