Add article about KB and bluespice

Author: zanetagebka

docs/Backend_tutorials/blue_spice/BS-KB-API.md

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+# BlueSpice & KB
+
+To communicate and integrate with EasyProject app our KnowlegeBase require one Rys which is BlueSpice. 
+It is well known that both projects needs testing and API adjustments from time to time as KnowledgeBase works on Wiki.
+In this section we will try to describe how to work with those projects when you want to make sure what is going on.
+
+---
+
+## Wiki API
+
+Most of the requests is common for each wiki app. You can find it documented [HERE](https://www.mediawiki.org/w/api.php).
+Also each knowledge base which is created by us contains it, so for example you can also check it on Easy KB, [HERE](https://www.es-kb.easysoftware.com/w/api.php).
+That part is helpful to understand the response and request made in case something is not working well, or the API was changed.
+
+
+## Postman Testing
+
+Now let's focus on step-by-step how-to in case you would like to test kb locally.
+
+To test our KnowledgeBase the best way is to use [Postman](https://www.postman.com/) to check the response output or what is happening under the hood.
+In this section we will focus on how to setup environment on Postman to be able to make it working.
+In a files folder you will find sub-folder called Postman.
+
+You will find there 2 files. 
+1. BlueSpice postman environment which contains variables needed to make the API calls working. Lets describe them one by one.
+
+* **kb-url** => It is a address of your KnowledgeBase url. You can take it from Kb deployment.
+* **client_id** => This is something you will find in the same place as the URL
+* **client_secret** => same as above
+* **access_token** => to get that one you need to do a API call. It will be describe later in this article
+* **username** => it is an login of the user you want to use (usually the one you are logged as in EasyProject app)
+
+To use this environment you simply need to import this file to Postman.
+To do that go to the app and on the left side select tab called Environments.
+Then click Import button which is placed on the top right under the top bar menu
+When you import BlueSpice environment hover over it and you will see thick icon. Check it and you will set the environment to active state.
+
+2. BlueSpice postman collection which contains collection of API calls that can be useful for you for testing our KB application.
+Each of the API call contains few tabs that are important to you to know.
+There are:
+- Auth tab - most of the API calls will require access_token mentioned previously
+- Headers - probably for most of the time it will not be bothering you
+- Body - some data (depends on the call) is required to be send in body, this is for example a case for sending client_id or client_secret, so make sure your data is there
+
+
+Let's describe the most important calls now.
+
+**POST Get access token action**
+
+This action is the one you need to call always to get the user access_token. This one is used to authorize user to KB.
+As we mentioned previously the access_token will be used in Auth tab for most of the API calls.
+
+**GET References**
+
+This action is used for checking the articles connected to specific Task/Issue. It should return list of articles assigned to it.
+As a parameter it use:
+* type: example: issues 
+* id: #id of issue
+
+**PUT Add Reference**
+
+This action is used for adding KB article to Issue. In a body of this request you will find exemplary structure that you should keep for a successful connection.
+You can also find it below:
+```
+{
+    "references": {
+        "entityType": "Issue",
+        "entityId": "778",
+        "pagename": "Check_%2B_verify_url_encoded_titles"
+    }
+}
+```
+
+**DELETE Reference**
+
+This is pretty self-explanatory. It is used for removing referenced article from the Issue.
+
+**PUT Sync groups**
+
+This request is also pretty important. It correspond to EasyProject button placed in blue_spice/rys_management on the bottom of page,
+called **Update Permissions**. It is used to make sure that user permission is up to date. Thanks to this either user has or has not access to knowledge base.
+