add: отчет о покрытии тестами

build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'java'
+    id 'jacoco'
 }
 
 wrapper {
@@ -32,3 +33,17 @@ dependencies {
 test {
     useJUnitPlatform()
 }
+
+jacoco {
+    toolVersion = '0.8.7'
+}
+
+jacocoTestReport {
+    afterEvaluate {
+        classDirectories.setFrom(files(classDirectories.files.collect {
+            fileTree(dir: it,
+                    exclude: ['mc/network/api/io/**']
+            )
+        }))
+    }
+}