docs: add description

Author: eureka-bpo

README.md

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+## requireDependencyRepository
+
+This project presents custom rule requireDependencyRepository for [maven-enforcer-plugin](https://maven.apache.org/enforcer/maven-enforcer-plugin/index.html).
+
+#### Purpose
+requireDependencyRepository is meant to ensure that specified artifact is received from specified repository.
+
+#### Minimum requirements
+- Java 8
+- Maven 3.6.3
+- Maven Enforcer Plugin 3.2.1
+
+#### Usage
+
+Example of usage.
+
+Add such declaration to your pom.xml:
+
+```xml
+<build>
+  <plugins>
+    ...
+    <plugin>
+      <artifactId>maven-enforcer-plugin</artifactId>
+      <executions>
+        <execution>
+          <id>enforce-dependency-repository</id>
+          <goals>
+            <goal>enforce</goal>
+          </goals>
+          <configuration>
+            <rules>
+              <requireDependencyRepository>
+                <repositoryId>YOUR REPOSITORY ID</repositoryId>
+                <groupId>YOUR GROUP ID</groupId>
+                <artifactId>YOUR ARTIFACT ID</artifactId>
+              </requireDependencyRepository>
+            </rules>
+          </configuration>
+        </execution>
+      </executions>
+      <dependencies>
+        <dependency>
+          <groupId>eu.eureka-bpo.maven</groupId>
+          <artifactId>require-dependency-repository</artifactId>
+          <version>SNAPSHOT</version>
+        </dependency>
+      </dependencies>
+    </plugin>
+  ...
+  </plugins>
+</build>
+```