chore(addons): update README

Author: lijianguo

README.md

@@ -20,3 +20,48 @@ The repository has the following structure:
   ├── docs                        # Documentation source files
   └── scripts                     # Scripts and tools which check and create addons
 ```
+
+### Service classes
+
+The repository has the following service classes:
+
+```
+CLASS NAME |   PLANS NAME  |           DESCRIPTION
+-----------|---------------|------------------------------------
+memcached  |  30           | Memcached 30 plan which which limit resources memory size 30Mi.
+memcached  |  100          | Memcached 100 plan which which limit resources memory size 100Mi.
+memcached  |  250          | Memcached 250 plan which which limit resources memory size 250Mi.
+memcached  |  1000         | Memcached 1000 plan which which limit resources memory size 1Gi.
+memcached  |  2500         | Memcached 2500 plan which which limit resources memory size 2.5Gi.
+memcached  |  5000         | Memcached 5000 plan which which limit resources memory size 5Gi.
+memcached  |  10000        | Memcached 10000 plan which which limit resources memory size 10Gi.
+memcached  |  20000        | Memcached 20000 plan which which limit resources memory size 20Gi.
+memcached  |  30000        | Memcached 30000 plan which which limit resources memory size 30Gi.
+memcached  |  40000        | Memcached 40000 plan which which limit resources memory size 40Gi.
+memcached  |  50000        | Memcached 50000 plan which which limit resources memory size 50Gi.
+mysql      |  standard-25  | mysql standard-25 plan which limit persistence size 25Gi.
+mysql      |  standard-50  | mysql standard-50 plan which limit persistence size 50Gi.
+mysql      |  standard-100 | mysql standard-100 plan which limit persistence size 100Gi.
+mysql      |  standard-200 | mysql standard-200 plan which limit persistence size 200Gi.
+mysql      |  standard-400 | mysql standard-400 plan which limit persistence size 400Gi.
+mysql      |  standard-800 | mysql standard-800 plan which limit persistence size 800Gi.
+mysql      |  standard-1600| mysql standard-1600 plan which limit persistence size 1600Gi.
+postgresql |  standard-16  | postgresql standard-16 plan which limit persistence size 16Gi.
+postgresql |  standard-64  | postgresql standard-64 plan which limit persistence size 64Gi.
+postgresql |  standard-256 | postgresql standard-256 plan which limit persistence size 256Gi.
+postgresql |  standard-512 | postgresql standard-512 plan which limit persistence size 512Gi.
+postgresql |  standard-768 | postgresql standard-768 plan which limit persistence size 768Gi.
+postgresql |  standard-1000| postgresql standard-1000 plan which limit persistence size 1Ti.
+redis      |  30           | Redis 30 plan which limit resources memory size 30Mi.
+redis      |  100          | Redis 100 plan which limit resources memory size 100Mi.
+redis      |  250          | Redis 250 plan which limit resources memory size 250Mi.
+redis      |  500          | Redis 500 plan which limit resources memory size 500Mi.
+redis      |  1000         | Redis 1000 plan which limit resources memory size 1Gi.
+redis      |  2500         | Redis 2500 plan which limit resources memory size 2.5Gi.
+redis      |  5000         | Redis 5000 plan which limit resources memory size 5Gi.
+redis      |  10000        | Redis 10000 plan which limit resources memory size 10Gi.
+redis      |  20000        | Redis 20000 plan which limit resources memory size 20Gi.
+redis      |  30000        | Redis 30000 plan which limit resources memory size 30Gi.
+redis      |  40000        | Redis 40000 plan which limit resources memory size 40Gi.
+redis      |  50000        | Redis 50000 plan which limit resources memory size 50Gi
+```