Added certificate table

app/src/main/java/eu/faircode/email/EntityCertificate.java

@@ -0,0 +1,59 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2019 by Marcel Bokhorst (M66B)
+*/
+
+import androidx.annotation.NonNull;
+import androidx.room.Entity;
+import androidx.room.Index;
+import androidx.room.PrimaryKey;
+
+import java.util.Objects;
+
+@Entity(
+        tableName = EntityCertificate.TABLE_NAME,
+        foreignKeys = {
+        },
+        indices = {
+                @Index(value = {"subject"}, unique = true),
+                @Index(value = {"email"}),
+        }
+)
+public class EntityCertificate {
+    static final String TABLE_NAME = "certificate";
+
+    @PrimaryKey(autoGenerate = true)
+    public Long id;
+    @NonNull
+    public String subject;
+    public String email;
+    @NonNull
+    public String data;
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof EntityCertificate) {
+            EntityCertificate other = (EntityCertificate) obj;
+            return (this.subject.equals(other.subject) &&
+                    Objects.equals(this.email, other.email) &&
+                    this.data.equals(other.data));
+        } else
+            return false;
+    }
+}