docs(README): Add usage examples

Also, enlarge the "Open in Colab" button

README.md

@@ -39,9 +39,11 @@ The package is intended to be used by coders, developers, technically-skilled tr
 
 ## Python SDK Tutorial
 
-[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)][Colab link]
-
-[Colab link]: https://colab.research.google.com/github/NibiruChain/py-sdk/blob/master/examples/collab_notebook.ipynb
+<a href="https://colab.research.google.com/github/NibiruChain/py-sdk/blob/master/examples/collab_notebook.ipynb" target="_blank">
+<p align="center">
+  <img src="https://colab.research.google.com/assets/colab-badge.svg" style="width: 300px;">
+</p>
+</a>
 
 ## Installation from `PyPI`
 
@@ -55,6 +57,79 @@ You may need to update `pip` to get this to run:
 python -m pip install --upgrade pip
 ```
 
+## Usage 
+
+#### Ex: Creating a wallet and SDK client
+
+```python
+from nibiru import wallet
+
+# Save the mnemonic for later
+mnemonic, private_key = wallet.PrivateKey.generate()
+```
+
+After, creating an account, you can create an `Sdk` instance. 
+
+```python
+import nibiru 
+
+network = nibiru.network.Network.testnet(2)
+sdk = nibiru.Sdk.authorize(mnemonic)
+  .with_network(network)
+```
+
+The `Sdk` class creates an interface to sign and send transactions or execute
+queries. It is associated with:
+- A transaction signer (wallet), which is configured from existing mnemonic to recover a `PrivateKey`.
+- A `Network`, which specifies the RPC, LCD, and gRPC endpoints for connecting to Nibiru Chain. 
+- An optional `TxConfig` for changing gas parameters.
+
+#### Ex: Using the faucet
+
+```python
+import requests
+
+requests.post(
+    "https://faucet.testnet-2.nibiru.fi/",
+    json={
+        "address": agent.address,
+        "coins": ["10000000unibi", "100000000000unusd"],
+    },
+)
+```
+
+#### Ex: Querying chain state
+
+```python
+# Querying the token balances of the account
+sdk.query.get_bank_balances(sdk.address)
+
+# Querying from the vpool module 
+query_resp = sdk.query.vpool.all_pools()
+print(query_resp)
+# Queries from other modules can be accessed from "sdk.query.module"
+```
+
+#### Ex: Submitting transactions 
+
+```python
+import nibiru
+from nibiru.msg
+
+tx_resp = sdk.tx.execute_msgs(
+    nibiru.msg.MsgOpenPosition(
+        sender=sdk.address,
+        token_pair="ubtc:unusd",
+        side=nibiru.common.Side.BUY,
+        quote_asset_amount=10,
+        leverage=10,
+        base_asset_amount_limit=0,
+    )
+)
+```
+
+You can broadcast any available transaction by passing its corresponding `Msg` to the `sdk.tx.execute_msgs` function. 
+
 ## Documentation Website
 
 Documentation can be found here: [Nibiru-py documentation](https://nibiru-py.readthedocs.io/en/latest/index.html)