Add readme step to build watchers (#7)

Part of [Generate watchers for sushiswap subgraphs deployed in graph-node](https://www.notion.so/Generate-watchers-for-sushiswap-subgraphs-deployed-in-graph-node-b3f2e475373d4ab1887d9f8720bd5ae6)

Reviewed-on: cerc-io/sushiswap-watcher-ts#7
Co-authored-by: Nabarun <nabarun@deepstacksoft.com>
Co-committed-by: Nabarun <nabarun@deepstacksoft.com>

README.md

@@ -1 +1,11 @@
 # sushiswap-watcher-ts
+
+Watchers for the [sushiswap-subgraphs](https://github.com/cerc-io/sushiswap-subgraphs/tree/watcher-ts) on Filecoin
+
+## Setup
+
+* Run the following command to install required packages:
+
+  ```bash
+  yarn && yarn build
+  ```

packages/blocks-watcher/README.md

@@ -7,11 +7,7 @@
 
 ## Setup
 
-* Run the following command to install required packages:
-
-  ```bash
-  yarn
-  ```
+* Follow root [README.md setup](../../README.md#setup)
 
 * Create a postgres12 database for the watcher:
 

packages/route-processor-watcher/README.md

@@ -7,11 +7,7 @@
 
 ## Setup
 
-* Run the following command to install required packages:
-
-  ```bash
-  yarn
-  ```
+* Follow root [README.md setup](../../README.md#setup)
 
 * Create a postgres12 database for the watcher:
 

packages/sushiswap-watcher/README.md

@@ -7,11 +7,7 @@
 
 ## Setup
 
-* Run the following command to install required packages:
-
-  ```bash
-  yarn
-  ```
+* Follow root [README.md setup](../../README.md#setup)
 
 * Create a postgres12 database for the watcher:
 

packages/v2-watcher/README.md

@@ -7,11 +7,7 @@
 
 ## Setup
 
-* Run the following command to install required packages:
-
-  ```bash
-  yarn
-  ```
+* Follow root [README.md setup](../../README.md#setup)
 
 * Create a postgres12 database for the watcher:
 

packages/v3-watcher/README.md

@@ -7,11 +7,7 @@
 
 ## Setup
 
-* Run the following command to install required packages:
-
-  ```bash
-  yarn
-  ```
+* Follow root [README.md setup](../../README.md#setup)
 
 * Create a postgres12 database for the watcher: