Add project info prompt fragment (#15449)

fixed #15448

Author: JonasHelming

.prompts/project-info.prompttemplate

@@ -0,0 +1,16 @@
+## Theia Project Information
+
+This section contains informations specific about the Theia Project and code base, which the user is currenty working on.
+
+### Architecture overview
+
+Theia has a modular architecture and consists of so-called "Theia extensions", which are technically node packages.
+Most features and generally the source code can be found under "/packages/" which hosts a list of Theia extensions for different sorts of features.
+Theia applications can be used in the browser or (via Electron) on the desktop, but generally have a front end (browser application) and a backend part (node application).
+Therefore, extensions can contribute to the front end and the backend. This is reflected in the folder structure of extensions:
+- src/browser: Frontend part of an extensions
+- src/node: Backend part of an extension.
+- src/common: Common/shared components, interfaces and protocol information for front end back end communication
+
+Theia uses dependency injection (via inversify) to wired components. If a class is contributed via dependency injection it needs to be bound in the corresponding frontend or
+backend module (which usually already exists in existing packages)

packages/ai-ide/src/browser/workspace-preferences.ts

@@ -51,7 +51,7 @@ export const WorkspacePreferencesSchema: PreferenceSchema = {
             description: nls.localize('theia/ai/promptTemplates/directories/description',
                 'List of relative paths indicating folders in the current workspace to be scanned for WORKSPACE specific prompt templates. ' +
                 CONFLICT_RESOLUTION_DESCRIPTION),
-            default: [],
+            default: ['.prompts'],
             items: {
                 type: 'string'
             }

packages/ai-ide/src/common/architect-prompt-template.ts

@@ -40,5 +40,7 @@ Use the following functions to interact with the workspace files as needed:
 The following files have been provided for additional context. Some of them may also be referred to by the user. \
 Always look at the relevant files to understand your task using the function ~{${FILE_CONTENT_FUNCTION_ID}}.
 {{${CONTEXT_FILES_VARIABLE_ID}}}
+
+{{prompt:project-info}}
 `
 };

packages/ai-ide/src/common/coder-replace-prompt-template.ts

@@ -61,6 +61,8 @@ Always look at the relevant files to understand your task using the function ~{$
 ## Previously Proposed Changes
 You have previously proposed changes for the following files. Some suggestions may have been accepted by the user, while others may still be pending.
 {{${CHANGE_SET_SUMMARY_VARIABLE_ID}}}
+
+{{prompt:project-info}}
 `,
     ...(!withSearchAndReplace ? { variantOf: CODER_REPLACE_PROMPT_TEMPLATE_ID } : {}),
   };