Update docs requirements

Author: app-generator

docs/how-to-create-db.md

@@ -1,4 +1,5 @@
 # How to create initial DB
 
-@todo
+@todo - SQLite
+
 

docs/how-to-manage-api-products.md

@@ -1,3 +1,11 @@
 # How manage products via API
 
-@todo
+How to:
+
+- visualize all products 
+- create (secure way)
+  - reserved for app registered users
+- update (secure way)
+  - reserved for app registered users
+- delete (secure way)
+  - reserved for app registered users

docs/how-to-manage-api-sales.md

@@ -1,3 +1,12 @@
-# How manage products via API
+# How manage Sales via API
 
-@todo
+
+How to:
+
+- visualize all sales 
+- create (secure way)
+  - reserved for app registered users
+- update (secure way)
+  - reserved for app registered users
+- delete (secure way)
+  - reserved for app registered users

docs/how-to-secure-api.md

@@ -1,3 +1,13 @@
 # How the API is secured
 
-@todo
+A secured API means:
+
+- Get requests (get all, get item) can be used in public space
+- Mutating requests are reserved for users registered in the app
+  - create 
+  - update
+  - delete
+
+This logic applies to all API nodes:
+- products
+- sales

docs/how-to-use-mysql.md

@@ -0,0 +1,5 @@
+# How to create initial DB
+
+@todo - MySql
+
+