add options to querier constructor

add readme

README.md

@@ -0,0 +1,84 @@
+# Terra
+
+---
+
+A terra client with some protocol partial implementations (anchor, prism, terraswap type routers, ...)
+
+To be able to compile, you need to add the following replace in your go.mod :
+
+```
+replace (
+	github.com/99designs/keyring => github.com/cosmos/keyring v1.1.7-0.20210622111912-ef00f8ac3d76
+	github.com/cosmos/cosmos-sdk => github.com/terra-money/cosmos-sdk v0.44.5-terra.2
+	github.com/cosmos/ledger-cosmos-go => github.com/terra-money/ledger-terra-go v0.11.2
+	github.com/gogo/protobuf => github.com/regen-network/protobuf v1.3.3-alpha.regen.1
+	github.com/tecbot/gorocksdb => github.com/cosmos/gorocksdb v1.2.0
+	github.com/tendermint/tendermint => github.com/terra-money/tendermint v0.34.14-terra.2
+	google.golang.org/grpc => google.golang.org/grpc v1.33.2
+)
+```
+
+
+## Examples
+
+---
+
+### Querying Anchor borrow limit
+
+```
+    ctx := context.Background()
+	
+    querier := terra.NewQuerier(
+		httpClient := &http.Client{
+            Timeout: 30 * time.Second,
+		}, 
+		"https://lcd.terra.dev")
+	
+    walletAddress, err := cosmos.AccAddressFromBech32("walletAddress")
+
+    anc, err := anchor.NewAnchor(querier)
+    if err != nil {
+        panic(err)
+    }
+    borrowLimit, err := anc.Overseer.BorrowLimit(ctx, walletAddress)
+    if err != nil {
+        panic(err)
+    }
+	
+```
+
+
+### Depositing UST to Anchor
+```
+    ctx := context.Background()
+	
+    querier := terra.NewQuerier(
+		httpClient := &http.Client{
+            Timeout: 30 * time.Second,
+		}, 
+		"https://lcd.terra.dev")
+	
+    wallet, err := terra.NewWalletFromMnemonic(
+        querier,
+        "mnemonic",
+        0,
+        0)
+    if err != nil {
+        panic(err)
+    }
+
+    anc, err := anchor.NewAnchor(querier)
+    if err != nil {
+        panic(err)
+    }
+    err = terra.NewTransaction(querier).
+        Message(func() (cosmos.Msg, error) {
+            return anc.Market.NewDepositUSTMessage(wallet.Address(), decimal.NewFromInt(100))
+        }).
+        ExecuteAndWaitFor(ctx, wallet)
+	
+	
+```
+
+
+

querier.go

@@ -33,13 +33,17 @@ func WithChainId(chainId string) QuerierOption {
 	}
 }
 
-func NewQuerier(httpClient *http.Client, url string) *Querier {
-	return &Querier{
+func NewQuerier(httpClient *http.Client, url string, options ...QuerierOption) *Querier {
+	q := &Querier{
 		url:            url,
 		httpClient:     httpClient,
 		encodingConfig: terraappparams.MakeEncodingConfig(),
 		chainId:        "columbus-5",
 	}
+	for _, option := range options {
+		q = option(q)
+	}
+	return q
 }
 
 func (q Querier) ChainId() string {