add RegistryApi

STRUCTURE.md

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+# Hlæja structure
+```mermaid
+graph RL;
+  CP[Core Plugin]
+  subgraph SCP [Common Plugin]
+    PL[Plugin Library]
+    PLM[Plugin Library Manifest]
+    PLP[Plugin Library Publish]
+    PCo[Plugin Common]
+    PCoD[Plugin Common Detekt]
+    PCoK[Plugin Common Ktlint]
+    PS[Plugin Service]
+    PSC[Plugin Service Container]
+    PSIT[Plugin Service Integration Test]
+    PSPR[Plugin Service Process Resource]
+    PCe[Plugin Certificate]
+  end
+  PCo --> PL
+  PLM --> PL
+  PLP --> PL
+  CP --> PCo
+  PCoD --> PCo
+  PCoK --> PCo
+  PCo --> PS
+  PSC --> PS
+  PSIT --> PS
+  PSPR --> PS
+  CML[Common Messages Library]
+  PL --> CML
+  DRS[Device Registry Service]
+  CML --> DRS
+  PS --> DRS
+  PCe --> DRS
+  DDS[Device Data Service]
+  CML --> DDS
+  PS --> DDS
+  DCS[Device Configuration Service]
+  CML --> DCS
+  PS --> DCS
+  DAS[Device API Service]
+  CML --> DAS
+  PS --> DAS
+  PCe --> DAS
+  RAS[Registry API Service]
+  CML --> RAS
+  PS --> RAS
+  PCe --> RAS
+```