Add initial documentation for the forms package and its patterns dire…

…ctory

packages/forms/README.md

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+# @atj/forms
+
+This library includes all of the core business logic of the Forms Platform.
+
+- [./src/services](./src/services): The public interface of the Forms Platform is implemented here
+- [./src/patterns](./src/patterns/README.md): Form building blocks, aka "patterns"
+- [./src/repository](./src/repository): Database routines
+- [./src/documents](./src/documents): Document ingest and creation
+- [./src/context](./src/context): Runtime contexts for the platform (testing, in-browser, server-side) are defined here

packages/forms/src/patterns/README.md

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+# Forms Platform - Patterns
+
+Patterns are the Forms Platform's primary building block, a reusable module that may be configured via the no-code form builder to craft custom user experiences.
+
+Patterns are stored on the form `Blueprint`'s pattern attribute.
+
+## Pattern configuration
+
+Each pattern must define a configuration object, which provides the definition of its behavior.
+
+The `PatternConfig` type is defined in [../pattern.ts](../pattern.ts).
+
+## Data structure
+
+Patterns are defined by the generic `Pattern<C>` type in `pattern.ts`.
+
+```typescript
+export type Pattern<C = any> = {
+  type: string;   // A string identifier for the pattern type
+  id: PatternId;  // A unique identifier for the pattern instance
+  data: C;        // The configuration data specific to the pattern type
+};
+```
+
+Constructing patterns may be accomplished manually, or via `PatternBuilder` helper classes.
+
+For example, an input pattern may be defined directly:
+
+```typescript
+const input: InputPattern = {
+  type: 'input',
+  id: 'my-input',
+  data: {
+    label: 'My input',
+    initial: '',
+    required: true,
+    maxLength: 64
+  },
+}
+```
+
+```typescript
+const input = new InputPatternBuilder();
+const page1 = new Page({ title: 'Page 1', patterns: [input1.id] });
+const pageSet = new PageSet({ pages: [page1.id] }, 'page-set');
+const page2 = new Page({ title: 'Page 2', patterns: [input1.id] });
+pageSet.addPage(page2)
+
+// Construct the pattern objects
+page1.toPattern();
+page2.toPattern();
+pageSet.toPattern();
+```
+