feat: v1.19.0 upgrade guide

upgrade/v1.19.0.md

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+# MainNet v1.18.x -> v1.19.0 Upgrade Instructions
+
+The following instructions will allow patch your node from v1.18.x to v1.19.0, and pre-download v1.19.0 upgrade binaries. The binaries must be placed in `~/.switcheod/cosmovisor/upgrades/v1.19.0` directory so that cosmovisor will switch to the right binaries at v1.19.0 upgrade block height.
+
+The v1.19.0 upgrade will be scheduled for [block 15014050](https://switcheo.org/blocks).
+
+**:exclamation: Run these steps in sequence, do not skip any steps! :exclamation:**
+
+1. Download and upgrade using the v1.19.0 release bundle.
+
+    The [v1.19.0 release bundle](https://github.com/Switcheo/tradehub/releases/tag/v1.19.0) contains v1.19.0 binaries.
+
+    We will be placing v1.19.0 binaries (`switcheod` / `switcheocli`) in the `cosmovisor/upgrades/v1.19.0` directory. Cosmovisor will switch to the right binary during the upgrade block height.
+
+    ```bash
+    curl -L https://github.com/Switcheo/tradehub/releases/download/v1.19.0/install-mainnet.tar.gz | tar -xz
+    cd install-mainnet && sudo ./install.sh && cd - && rm -rf install-mainnet
+
+    # place pre-download v1.19.0 binaries into upgrades/v1.19.0 directory
+    sudo cp -r /etc/switcheoctl/cosmovisor/upgrades/v1.19.0 ~/.switcheod/cosmovisor/upgrades
+    ```
+
+    Note that v1.19.0 will be running automatically after block 15014050. You may check the version of your node after block 15014050.
+
+2. Check that you have configured the right versions of `switcheod` for `cosmovisor` to switch over correctly.
+
+    Ensure that you have the right binaries installed under the `cosmovisor` and `usr/local/bin` directories:
+
+    ```bash
+    openssl sha256 ~/.switcheod/cosmovisor/upgrades/v1.19.0/bin/switcheod
+    # c8f82bb141889c8184daf86b205864c00dbdacebe059e0b447b595d290a6a36c
+    ```