Add basic user and subscription config, docs, tests

Author: Sporiff

.env-sample

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+POSTGRES_USER=myuser
+POSTGRES_PASSWORD=mypassword
+POSTGRES_DB=mydatabase
+POSTGRES_HOST=127.0.0.1
+POSTGRES_PORT=5432
+POSTGRES_SSL_MODE=disable
+
+REDIS_HOST=127.0.0.1
+REDIS_PORT=6379
+
+ADMIN_USERNAME=admin
+ADMIN_EMAIL=
+ADMIN_PASSWORD=

.gitattributes

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+/mvnw text eol=lf
+*.cmd text eol=crlf

.gitignore

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+HELP.md
+target/
+.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Sensitive files ###
+.env

.mvn/wrapper/maven-wrapper.properties

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+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.11/apache-maven-3.9.11-bin.zip

compose.yaml

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+services:
+  postgres:
+    image: 'postgres:latest'
+    env_file:
+      - .env
+    ports:
+      - '5432:5432'
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+  redis:
+    image: 'redis:latest'
+    env_file:
+      - .env
+    ports:
+      - '6379:6379'
+
+volumes:
+  postgres_data: