Added installation notes for windows users and added postgres setup instructions.

documentation/docs/contributing/development.mdx

@@ -14,7 +14,7 @@ If you're looking for a place to get started, check out the list of [Github Issu
 
 ## Local Server Installation
 ### Using Pip
-#### 1. Install
+#### 1. Khoj Installation
 ```mdx-code-block
 import Tabs from '@theme/Tabs';
 import TabItem from '@theme/TabItem';
@@ -60,9 +60,54 @@ pip install -e '.[dev]'
     </TabItem>
   </Tabs>
 ```
+#### 2. Postgres Installation & Setup
 
+Khoj uses the `pgvector` package to store embeddings of your index in a Postgres database. To use this, you need to have Postgres installed.
 
-#### 2. Run
+```mdx-code-block
+  <Tabs groupId="operating-systems">
+    <TabItem value="macos" label="MacOS">
+Install [Postgres.app](https://postgresapp.com/). This comes pre-installed with `pgvector` and relevant dependencies.
+    </TabItem>
+    <TabItem value="win" label="Windows">
+    1. Use the [recommended installer](https://www.postgresql.org/download/windows/).
+    2. Follow instructions to [Install PgVector](https://github.com/pgvector/pgvector#windows) in case you need to manually install it. Windows support is experimental for pgvector currently, so we recommend using Docker. Refer to Windows Installation Notes below if there are errors.
+    </TabItem>
+    <TabItem value="unix" label="Linux">
+    From [official instructions](https://wiki.postgresql.org/wiki/Apt)
+    </TabItem>
+    <TabItem value="source" label="From Source">
+    1. Follow instructions to [Install Postgres](https://www.postgresql.org/download/)
+    2. Follow instructions to [Install PgVector](https://github.com/pgvector/pgvector#installation) in case you need to manually install it.
+    </TabItem>
+  </Tabs>
+```
+
+##### Create the Khoj database
+
+Make sure to update your environment variables to match your Postgres configuration if you're using a different name. The default values should work for most people. When prompted for a password, you can use the default password `postgres`, or configure it to your preference. Make sure to set the environment variable `POSTGRES_PASSWORD` to the same value as the password you set here.
+
+```mdx-code-block
+  <Tabs groupId="operating-systems">
+    <TabItem value="macos" label="MacOS">
+    ```shell
+createdb khoj -U postgres --password
+    ```
+    </TabItem>
+    <TabItem value="win" label="Windows">
+    ```shell
+createdb -U postgres khoj --password
+      ```
+    </TabItem>
+    <TabItem value="unix" label="Linux">
+      ```shell
+sudo -u postgres createdb khoj --password
+      ```
+    </TabItem>
+  </Tabs>
+```
+
+#### 3. Run
 1. Start Khoj
    ```bash
    khoj -vv
@@ -72,6 +117,37 @@ pip install -e '.[dev]'
 
   Note: Wait after configuration for khoj to Load ML model, generate embeddings and expose API to query notes, images, documents etc specified in config YAML
 
+#### Windows Installation Notes
+1. Command `khoj` Not Recognized
+    - Try reactivating the virtual environment and rerunning the `khoj` command.
+    - If it still doesn't work repeat the installation process.
+2. Python Package Missing *Usually says import xxx not recognized*
+    - Use `pip install xxx` and try running the `khoj` command.
+3. Command `createdb` Not Recognized
+    - make sure path to postgres binaries is included in environment variables. It usually looks something like
+    ```
+    C:\Program Files\PostgreSQL\16\bin
+    ```
+4. Connection Refused on port xxxx
+    - Locate the `pg_hba.conf` file in the location where postgres was installed.
+    - Edit the file to have **trust** as the method for user postgres, local, and host connections.
+    - Below is an example:
+```
+host    all             postgres        127.0.0.1/32            trust
+# "local" is for Unix domain socket connections only
+local   all             all                                     trust
+# IPv4 local connections:
+host    all             all             127.0.0.1/32            trust
+# IPv6 local connections:
+host    all             all             ::1/128                 trust
+```
+4. Errors with installing pgvector
+    - Reinstall Visual Studio 2022 Build Tools with: 
+      1. desktop development with c++ selected in workloads
+      2. MSVC (C++ Build Tools), Windows 10/11 SDK, and C++/CLI support for build tools selected in individual components.
+    - Open the x64 Native Tools Command Prompt as an Administrator
+    - Follow the pgvector windows installation [instructions](https://github.com/pgvector/pgvector?tab=readme-ov-file#windows) in this command prompt.
+
 ### Using Docker
 
 Make sure you install the latest version of [Docker](https://docs.docker.com/get-docker/) and [Docker Compose](https://docs.docker.com/compose/install/).