Added a status field to each entry (see issue #2)

providers.json

@@ -2,6 +2,7 @@
     {
         "endpoint": "http://texts.alpheios.net/api/dts",
         "protocol": "dts",
+        "status": "experimental",
         "label": "Alpheios Texts",
         "contact": {
           "email": "mailto:[email protected]",
@@ -11,6 +12,7 @@
     {
         "endpoint": "http://dev.chartes.psl.eu/api/nautilus/dts",
         "protocol": "dts",
+        "status": "demo",
         "label": "École des Chartes Demo",
         "contact": {
           "email": "mailto:[email protected]",
@@ -21,6 +23,7 @@
         "endpoint": "http://betamasaheft.eu/api/dts",
         "protocol": "dts",
         "name": "Beta maṣāḥǝft",
+        "status": "experimental",
         "contact": {
           "email": "mailto:[email protected]",
           "name": "Pietro Liuzzo"
@@ -29,6 +32,7 @@
     {
       "endpoint": "https://edh-www.adw.uni-heidelberg.de/api/dts/",
       "protocol": "dts",
+      "status": "experimental",
       "contact": {
         "email": "mailto:[email protected]",
         "name": "Franz Grieshaber",