docs:add build markdwon file (#58)

Signed-off-by: Henrique Rodrigues <henrique.rodrigues@zup.com.br>

BUILD.md

@@ -0,0 +1,84 @@
+# **BUILD**
+
+## **Table of contents** 
+### 1. [**About**](#about)
+### 2. [**Environment**](#environment)
+### 3. [**Development**](#development)
+>#### 3.1. [**Style Guide**](#style-guide)
+>#### 3.2. [**Tests**](#tests)
+>#### 3.3. [**Security**](#security)
+
+## **About**
+
+The **BUILD.md** is a file to check the environment and build specifications of **horusec-engine** project.
+
+
+## **Environment**
+
+- [**Golang**](https://go.dev/dl/):  ^1.17.X
+- [**GNU Make**](https://www.gnu.org/software/make/): ^4.2.X
+
+## **Development**
+
+Horusec-Engine is the standalone SAST engine used by [Horusec-CLI](https://github.com/ZupIT/horusec).
+
+You can use it as a package by running the following command in your Golang project:
+
+```bash
+go get github.com/ZupIT/horusec-engine
+```
+
+### **Style Guide**
+
+The project uses the [**golangci-lint**](https://golangci-lint.run) tool as a Go linter aggregator.
+You can perform the lint check via the `make` command available in each microservice:
+
+```bash
+make lint
+```
+
+To perform the indentation and removal of unused code automatically, just run the following command:
+
+```bash
+make fmt
+```
+
+The project also has a pattern of dependency imports, and the command below organizes your code in the pattern defined by the Horusec team, this command must be run in each microservice:
+
+```bash
+make fix-imports
+```
+
+All project files must have the [**license header**](./copyright.txt). You can check if all files are in agreement by running the following command in project root:
+
+```bash
+make license
+```
+
+If it is necessary to add the license in any file, run the command below to insert it in all files that do not have it:
+
+```bash
+make license-fix
+```
+
+### **Tests**
+
+The unit tests were written with the [**standard package**](https://pkg.go.dev/testing) and some mock and assert snippets, we used the [**testify**](https://github.com/stretchr/testify). You can run the tests using the command below:
+
+```bash
+make test
+```
+
+To check test coverage, run command below:
+
+```bash
+make coverage
+```
+
+### **Security**
+
+We use the latest version of [**Horusec-CLI**](https://github.com/ZupIT/horusec) to maintain the security of our source code. Through the command below, you can perform this verification in the project:
+
+```bash
+make security
+```