Adding more documentation

README.md

@@ -269,6 +269,19 @@ class SomeClass {
     }
 }
 ``` 
+
+## Suppress groups of inspections
+It is easy to suppress even groups of inspections in diKTat.
+
+These groups are linked to chapters of [Codestyle](info/guide/diktat-coding-convention.md). 
+
+To disable chapters, you will need to add the following configuration to common configuration (`- name: DIKTAT_COMMON`):
+```yaml
+    disabledChapters: "1, 2, 3"
+```  
+
+Mapping of inspections to chapters can be found in [Groups of Inspections](info/rules-mapping.md) .
+
 ## How to contribute?
 
 Main components are:

diktat-analysis.yml

@@ -5,6 +5,9 @@
     # put your package name here - it will be autofixed and checked
     domainName: org.cqfn.diktat
     # testDirs: test
+    # can also use chapter names here (not only numbers)
+    # expected values:  disabledChapters: "Naming, Comments, General, Variables, Functions, Classes"
+    # or: "1, 2, 3, 4, 5, 6"
     disabledChapters: ""
     testDirs: test
     kotlinVersion: 1.5

diktat-gradle-plugin/README.md

@@ -6,4 +6,11 @@ To avoid versions duplication, diktat and ktlint versions are passed to gradle v
 These versions are then written in a file and then included in the plugin jar to determine dependencies for JavaExec.
 
 Gradle plugin marker pom, which is normally produced by `java-gradle-plugin` plugin during gradle build,
-is added manually as a maven module.
+is added manually as a maven module.
+
+Please be advised that to run functional tests of Gradle plugin you will need to have Java 11 or **older**.
+This does not affect the plugin itself and only affect functional tests :
+```
+Starting Build
+java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.vmplugin.v7.Java7
+```

diktat-rules/src/main/resources/diktat-analysis.yml

@@ -4,6 +4,8 @@
     # put your package name here - it will be autofixed and checked
     domainName: your.name.here
     testDirs: test
+    # expected values:  disabledChapters: "Naming, Comments, General, Variables, Functions, Classes"
+    # or: "1, 2, 3, 4, 5, 6"
     disabledChapters: ""
     kotlinVersion: 1.5
     srcDirectories: "main"