chore(env): Adding required env inside chaosengine (#479)

Signed-off-by: shubhamchaudhary <shubham@chaosnative.com>

charts/aws-ssm/aws-ssm-chaos-by-id/engine.yaml

@@ -27,3 +27,36 @@ spec:
             # provide the region name of the target instances
             - name: REGION
               value: ''
+
+             # provide the percentage of available memory to stress
+            - name: MEMORY_PERCENTAGE
+              value: '80'
+
+            # provide the CPU chores to be comsumed
+            # 0 will consume all the available cpu cores
+            - name: CPU_CORE
+              value: '0'
+
+            # Provide the name of ssm doc 
+            # if not using the default stress docs  
+            - name: DOCUMENT_NAME
+              value: ''
+
+            # Provide the type of ssm doc 
+            # if not using the default stress docs  
+            - name: DOCUMENT_TYPE
+              value: ''
+
+            # Provide the format of ssm doc
+            # if not using the default stress docs  
+            - name: DOCUMENT_FORMAT
+              value: ''
+
+            # Provide the path of ssm doc 
+            # if not using the default stress docs  
+            - name: DOCUMENT_PATH
+              value: ''
+
+             # if you want to install dependencies to run default ssm docs
+            - name: INSTALL_DEPENDENCIES
+              value: 'True'