feat(test): starting integration test plan

packages/__tests__/integration/test-plan.md

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+### `@aurelia/runtime`
+
+#### call-binding
+
+Assigns the result of the method call to the attribute.
+
+```html
+<el attr="func()"></el>
+```
+
+#### interpolation-binding
+
+Evaluates interpolation expression.
+
+### Test plan
+
+#### Atoms
+
+##### Read-only textual CE
+
+**Usage:**
+
+```html
+<my-text value.bind="val-expr"></my-text>
+```
+TODO: need better name than `my-text`.
+
+**Definition:**
+
+```html
+${value}
+```
+
+**Potential coverage targets**
+
+- interpolation binding
+- call-binding (with the help of a higher-level CE that binds the value using a method call)
+- i18n (maybe later)
+
+#### Molecules
+
+##### Greetings
+
+**Usage:**
+
+```html
+<greeting name.bind="expr" is-birthday.bind="expr"></greeting>
+```
+
+**Definition:**
+
+```html
+<my-text value.bind="getGreeting()"></my-text>
+```
+
+**Potential coverage targets**
+
+- call-binding