Add tests for data persistence binding

Add test tree structures
Add tests for persistence binding
Add dependency in README.md

Change-Id: If3fa3450fa61cd7e440712354b123d02934e2488
Signed-off-by: Frederic Marec <frederic.marec@iot.bzh>
(cherry picked from commit 5663caee2540dbc769d39c1e255c35493169b037)

1 files changed, 29 insertions, 15 deletions

diff --git a/README.md b/README.md
index fb420dc..979d35e 100644
--- a/README.md
+++ b/README.md
@@ -1,38 +1,52 @@
 
 # Database Binding
+
 This binding provide a database API with key/value semantics.
 The backend is currently a Berkeley DB.
 
 ## Verbs
+
 * **insert**:
-	This verb insert a key/value pair in the database.
-	If the key already exist, the verb fails.
-	
+
+    This verb insert a key/value pair in the database.
+    If the key already exist, the verb fails.
+
 * **update**:
-	This verb update an existing record.
-	If the key doesn't exist, the verb fails.
-	
+
+    This verb update an existing record.
+    If the key doesn't exist, the verb fails.
+
 * **delete**:
-	This verb remove an existing key/value pair from the database.
-	If no matching record is found, the verb fails.
+
+    This verb remove an existing key/value pair from the database.
+    If no matching record is found, the verb fails.
 
 * **read**:
-	This verb get the value associated with the specified key.
-	If no matching record is found, the verb fails.
+
+    This verb get the value associated with the specified key.
+    If no matching record is found, the verb fails.
 
 ## Arguments
+
 * The **read** and **delete** verbs need only a **key** to work:
-```
+
+```code
 {
-	"key": "mykey"
+    "key": "mykey"
 }
 ```
 
 * The **insert** and **update** verbs need a **key** and a **value** to work:
-```
+
+```code
 {
-	"key": "mykey",
-	"value": "my value"
+    "key": "mykey",
+    "value": "my value"
 }
 ```
+
 The **value** can be any valid json.
+
+## Dependencies
+
+You must install BerkeleyDB and GDBM
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