readme added for multichain and delegation (snapshot-labs#78)

* Create README.md

* Create README.md

src/strategies/delegation/README.md

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+# delegation
+
+If you want to delegate your voting power to another wallet address, you can do this using the “delegation strategy”. In delegation strategy, if A delegates to B and both of them vote, then the delegated voting power is not calculated. Only the vote of A will be calculated. The vote of B will be counted if A does not vote. 
+
+In delegation strategy, the sub strategies defined in params are used to delegate vote from one address to another.
+
+
+Here is an example of parameters:
+
+```json
+{
+  "symbol": "YFI (delegated)",
+  "strategies": [
+    {
+      "name": "erc20-balance-of",
+      "params": {
+        "address": "0xBa37B002AbaFDd8E89a1995dA52740bbC013D992",
+        "symbol": "YFI",
+        "decimals": 18
+      }
+    },
+    {
+      "name": "yearn-vault",
+      "params": {
+        "address": "0xBA2E7Fed597fd0E3e70f5130BcDbbFE06bB94fe1",
+        "symbol": "YFI (yYFI)",
+        "decimals": 18
+      }
+    }
+  ]
+}
+
+```

src/strategies/multichain/README.md

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+# multichain
+
+If you want to calculate the balance from various chains like Ethereum, Binance smart chain, polygon etc. and use them for voting using various strategies, you can do it by using a strategy called “multichain strategy”. This allows cross chain voting in which multiple chains can be used together to calculate the voting power.
+
+In multichain strategy, the params should define sub strategies which would use different networks mentioned in the field to combine the voting power.
+
+Here is an example of parameters:
+
+In the below example, the tokens on the three networks namely ethereum, polygon and bsc denotes combined voting power.
+
+
+```json
+{
+  "symbol": "MULTI",
+  "strategies": [
+    {
+      "name": "erc20-balance-of",
+      "network": "1",
+      "params": {
+        "address": "0x579cea1889991f68acc35ff5c3dd0621ff29b0c9",
+        "decimals": 18
+      }
+    },
+    {
+      "name": "erc20-balance-of",
+      "network": "137",
+      "params": {
+        "address": "0xB9638272aD6998708de56BBC0A290a1dE534a578",
+        "decimals": 18
+      }
+    },
+    {
+      "name": "erc20-balance-of",
+      "network": "56",
+      "params": {
+        "address": "0x0e37d70b51ffa2b98b4d34a5712c5291115464e3",
+        "decimals": 18
+      }
+    },
+    {
+      "name": "erc20-balance-of",
+      "network": 137,
+      "params": {
+        "address": "0xfC0fA725E8fB4D87c38EcE56e8852258219C64Ee",
+        "decimals": 18
+      }
+    }
+  ],
+  "graphs": {
+    "56": "https://api.thegraph.com/subgraphs/name/apyvision/block-info",
+    "137": "https://api.thegraph.com/subgraphs/name/sameepsi/maticblocks"
+  }
+}
+
+```