doc: added some rough documentation.

README.md

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+# Skynet LDAP backend
+
+Basic information on the Skynet ldap backend for use on <https://sso.skynet.ie>
+
+
+### Error: HTTP 500  
+No indication of the issue is returned to teh frontend.
+
+## Routes
+Base URL: <https://api.sso.skynet.ie>
+
+
+### POST /ldap/update
+Fields:
+* userPassword
+* mail
+* sshPublicKey
+* cn
+* sn
+* skDiscord
+
+```json
+{ 
+  "user" : "username", 
+  "pass" : "password",
+  "field": "field to change",
+  "value": "new value of field"
+}
+```
+
+Changing ``userPassword`` requires the existing password in teh apssword field and the new one in teh value field.
+
+### POST /ldap/new
+
+```json
+{ 
+  "user" : "username the user wants", 
+  "mail" : "An email account that matches what is on wolves",
+  "name_first": "Firstname",
+  "name_second": "Surname"
+}
+```
+
+Username taken: 
+```json
+{"result": "error", "error": "username not available"}
+```
+
+Email used:
+```json
+{"result": "error", "error": "email in use"}
+```
+
+### POST /ldap/new/verify
+
+```json
+{
+  "auth_code": "Auth code that got send in the email",
+  "password": "Password the user wants to use"
+}
+```
+
+Auth code non existent:
+```json
+{"result": "error"}
+```
+
+
+## Responses
+
+Generic responses which is used unless otherwise specified above.
+
+### Success: HTTP 200
+```json
+{
+    "result": "success"
+}
+```