chore: refactor layout for multiple packages (#99)

* added lint file for each package

* moved langchain package

* Added template files for monorepo

* move ci into package folder

* fix lint error

* move files to correct path

* remove redundant init file

* update readme

* do not rename repo yet

* keep original readme for now

Author: twishabansal

.github/workflows/lint.yaml renamed to .github/workflows/lint-toolbox-langchain.yaml

@@ -12,9 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-name: lint
+name: langchain
 on:
   pull_request:
+    paths:
+      - 'packages/toolbox-langchain/**'
+      - '!packages/toolbox-langchain/**/*.md'
   pull_request_target:
     types: [labeled]
 
@@ -29,6 +32,9 @@ jobs:
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
       cancel-in-progress: true
+    defaults:
+      run:
+        working-directory: ./packages/toolbox-langchain
     permissions:
       contents: 'read'
       issues: 'write'

CHANELOG.md

@@ -0,0 +1,5 @@
+Please refer to each API's `CHANGELOG.md` file under the `packages/` directory
+
+Changelogs
+-----
+- [toolbox-langchain==0.1.0](https://github.com/googleapis/genai-toolbox-langchain-python/tree/main/packages/toolbox-langchain/CHANGELOG.md)

CHANGELOG.md renamed to packages/toolbox-langchain/CHANGELOG.md

@@ -4,12 +4,13 @@ Below are the details to set up a development environment and run tests.
 
 ## Install
 1. Clone the repository:
+   TODO: Correct repo URL
     ```bash
     git clone https://github.com/googleapis/genai-toolbox-langchain-python
     ```
-1. Navigate to the repo directory:
+1. Navigate to the package directory:
     ```bash
-    cd genai-toolbox-langchain-python
+    cd genai-toolbox-langchain-python/packages/toolbox-langchain
     ```
 1. Install the package in editable mode, so changes are reflected without
    reinstall:
@@ -22,9 +23,9 @@ Below are the details to set up a development environment and run tests.
 > those changes reflected immediately without reinstalling the package.
 
 ## Test
-1. Navigate to the repo directory if needed:
+1. Navigate to the package directory if needed:
     ```bash
-    cd genai-toolbox-langchain-python
+    cd genai-toolbox-langchain-python/packages/toolbox-langchain
     ```
 1. Install the SDK and test dependencies:
     ```bash