Adding security rules for the Instagram and LinkedIn samples.

Change-Id: Id2f8cf4b53fa79a1ee434c188399b692b2220b84

Author: Nicolas Garnier

instagram-auth/database.rules.json

@@ -0,0 +1,10 @@
+{
+  "rules": {
+    "instagramAccessToken": {
+      "$uid": {
+        ".read": "auth.uid === $uid",
+        ".write": "auth.uid === $uid"
+      }
+    }
+  }
+}

instagram-auth/firebase.json

@@ -1,4 +1,7 @@
 {
+  "database": {
+    "rules": "database.rules.json"
+  },
   "hosting": {
     "public": "public"
   }

linkedin-auth/database.rules.json

@@ -0,0 +1,10 @@
+{
+  "rules": {
+    "linkedInAccessToken": {
+      "$uid": {
+        ".read": "auth.uid === $uid",
+        ".write": "auth.uid === $uid"
+      }
+    }
+  }
+}

linkedin-auth/firebase.json

@@ -1,4 +1,7 @@
 {
+  "database": {
+    "rules": "database.rules.json"
+  },
   "hosting": {
     "public": "public"
   }