add docs

docs/installation.md

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+# How to install?
+## Installation
+
+You can install LangFlow from pip:
+
+```py
+pip install langflow
+```
+
+Next, run:
+
+```py
+python -m langflow
+```
+
+or
+
+```py
+langflow
+```
+
+---
+
+## Run Locally
+
+Run locally by cloning the repository and installing the dependencies. We recommend using a virtual environment to isolate the dependencies from your system.
+
+<br>
+
+Before you start, make sure you have the following installed:
+
+- Poetry
+- Node.js
+
+For the backend, you will need to install the dependencies and start the development server.
+
+```bash
+poetry install
+make run_backend
+```
+
+For the frontend, you will need to install the dependencies and start the development server.
+
+```bash
+cd src/frontend
+npm install
+npm start
+```
+
+---
+
+## Docker compose
+
+This will run the backend and frontend in separate containers. The frontend will be available at `localhost:3000` and the backend at `localhost:7860`.
+
+```bash
+docker compose up --build
+# or
+make dev build=1
+```