lint: add markdown linter (#5254)

docs/app-dev/getting-started.md

@@ -32,7 +32,7 @@ echo export GO111MODULE=on >> ~/.bash_profile
 
 Then run
 
-```
+```sh
 go get github.com/tendermint/tendermint
 cd $GOPATH/src/github.com/tendermint/tendermint
 make tools
@@ -55,7 +55,7 @@ full transaction bytes are stored as the key and the value.
 
 Let's start a kvstore application.
 
-```
+```sh
 abci-cli kvstore
 ```
 
@@ -64,7 +64,7 @@ Tendermint binary installed. If not, follow the steps from
 [here](../introduction/install.md). If you have never run Tendermint
 before, use:
 
-```
+```sh
 tendermint init
 tendermint node
 ```
@@ -77,7 +77,7 @@ details, see [the guide on using Tendermint](../tendermint-core/using-tendermint
 You should see Tendermint making blocks! We can get the status of our
 Tendermint node as follows:
 
-```
+```sh
 curl -s localhost:26657/status
 ```
 
@@ -86,7 +86,7 @@ tool like [jq](https://stedolan.github.io/jq/) or `json_pp`.
 
 Now let's send some transactions to the kvstore.
 
-```
+```sh
 curl -s 'localhost:26657/broadcast_tx_commit?tx="abcd"'
 ```
 
@@ -96,7 +96,7 @@ transaction with bytes `abcd`, so `abcd` will be stored as both the key
 and the value in the Merkle tree. The response should look something
 like:
 
-```
+```json
 {
   "jsonrpc": "2.0",
   "id": "",
@@ -123,13 +123,13 @@ like:
 We can confirm that our transaction worked and the value got stored by
 querying the app:
 
-```
+```sh
 curl -s 'localhost:26657/abci_query?data="abcd"'
 ```
 
 The result should look like:
 
-```
+```json
 {
   "jsonrpc": "2.0",
   "id": "",
@@ -153,14 +153,14 @@ human-readable](https://github.com/tendermint/tendermint/issues/1794).
 
 Now let's try setting a different key and value:
 
-```
+```sh
 curl -s 'localhost:26657/broadcast_tx_commit?tx="name=satoshi"'
 ```
 
 Now if we query for `name`, we should get `satoshi`, or `c2F0b3NoaQ==`
 in base64:
 
-```
+```sh
 curl -s 'localhost:26657/abci_query?data="name"'
 ```
 
@@ -196,13 +196,13 @@ Let's kill the previous instance of `tendermint` and the `kvstore`
 application, and start the counter app. We can enable `serial=on` with a
 flag:
 
-```
+```sh
 abci-cli counter --serial
 ```
 
 In another window, reset then start Tendermint:
 
-```
+```sh
 tendermint unsafe_reset_all
 tendermint node
 ```
@@ -211,14 +211,14 @@ Once again, you can see the blocks streaming by. Let's send some
 transactions. Since we have set `serial=on`, the first transaction must
 be the number `0`:
 
-```
+```sh
 curl localhost:26657/broadcast_tx_commit?tx=0x00
 ```
 
 Note the empty (hence successful) response. The next transaction must be
 the number `1`. If instead, we try to send a `5`, we get an error:
 
-```
+```json
 > curl localhost:26657/broadcast_tx_commit?tx=0x05
 {
   "jsonrpc": "2.0",
@@ -237,7 +237,7 @@ the number `1`. If instead, we try to send a `5`, we get an error:
 
 But if we send a `1`, it works again:
 
-```
+```json
 > curl localhost:26657/broadcast_tx_commit?tx=0x01
 {
   "jsonrpc": "2.0",
@@ -263,7 +263,7 @@ to [install node](https://nodejs.org/en/download/).
 You'll also need to fetch the relevant repository, from
 [here](https://github.com/tendermint/js-abci), then install it:
 
-```
+```sh
 git clone https://github.com/tendermint/js-abci.git
 cd js-abci
 npm install abci
@@ -271,13 +271,13 @@ npm install abci
 
 Kill the previous `counter` and `tendermint` processes. Now run the app:
 
-```
+```sh
 node example/counter.js
 ```
 
 In another window, reset and start `tendermint`:
 
-```
+```sh
 tendermint unsafe_reset_all
 tendermint node
 ```
@@ -286,7 +286,7 @@ Once again, you should see blocks streaming by - but now, our
 application is written in Javascript! Try sending some transactions, and
 like before - the results should be the same:
 
-```
+```sh
 # ok
 curl localhost:26657/broadcast_tx_commit?tx=0x00
 # invalid nonce