add sonarqube configuration & README.md && additionally improving gitlab configuration

sonarqube/README.md

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+# Sonarqube Configuration
+
+## Setup Sonarqube
+
+before first run, change permissions on sonarqube volumes dirs from root to 1000:
+```bash
+sudo chown 1000:1000 -R ./volumes/sonarqube
+```
+
+before start sonarqube vm.max_map_count must be changed on your host:
+```bash
+sudo sysctl -w vm.max_map_count=262144
+```
+
+after running, you can login with default credentials (admin:admin)
+
+## Configure projects
+
+first step is create access token in gitlab and set it in sonarqube app
+
+next one is choice of repository, if you did choice, you will saw instruction.
+
+we must create ```sonar-project.properties``` file in choosen repo:
+
+```properties
+sonar.projectKey=<repo_name_and_hash>
+sonar.qualitygate.wait=true
+```
+
+we must define also ```.gitlab-ci.yml``` file in choosen repo:
+
+```yml
+sonarqube-check:
+  image: 
+    name: sonarsource/sonar-scanner-cli:latest
+    entrypoint: [""]
+  variables:
+    SONAR_USER_HOME: "${CI_PROJECT_DIR}/.sonar"  # Defines the location of the analysis task cache
+    GIT_DEPTH: "0"  # Tells git to fetch all the branches of the project, required by the analysis task
+  cache:
+    key: "${CI_JOB_NAME}"
+    paths:
+      - .sonar/cache
+  script: 
+    - |
+      sonar-scanner \
+        -Dsonar.projectKey="${SONAR_REPO_ID}" \
+        -Dsonar.sources=. \
+        -Dsonar.host.url="${SONAR_HOST_URL}" \
+        -Dsonar.login="${SONAR_TOKEN}"
+  allow_failure: true
+  only:
+    - develop
+```
+
+last step is define envs in gitlab -> choosen repo -> Settings -> CI/CD -> Variables:
+
+```env
+SONAR_REPO_ID=<repo_name_and_hash>
+SONAR_HOST_URL=http://<sonarqube_url_or_dns>:<sonarqube_shared_port>
+SONAR_TOKEN=<sonar_token>
+```
+
+you can generate ```SONAR_TOKEN``` in Overview -> Locally
+
+you can get ```SONAR_REPO_ID``` from Overview -> Gitlab-CI in ```sonar-project.properties``` file creating statement

sonarqube/docker-compose.yml

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+version: "3.9"
+
+services:
+
+  sonarqube:
+    container_name: sonarqube
+    image: sonarqube:9-community
+    ports:
+      - 9000:9000
+    environment:
+      SONARQUBE_JDBC_USERNAME: tbs093a
+      SONARQUBE_JDBC_PASSWORD: aCD32Sfqw
+      SONARQUBE_JDBC_URL: jdbc:postgresql://postgresql:5432/sonar  
+    volumes:
+      - ./volumes/sonarqube/data:/opt/sonarqube/data
+      - ./volumes/sonarqube/logs:/opt/sonarqube/logs
+      - ./volumes/sonarqube/extensions:/opt/sonarqube/extensions
+
+  postgresql:
+    container_name: postgresql
+    image: postgres:15.2-alpine
+    environment:
+      POSTGRES_USER: tbs093a
+      POSTGRES_PASSWORD: aCD32Sfqw
+    ports:
+      - 5432
+    volumes:
+      - ./volumes/postgresql:/var/lib/postgresql
+