Add Foundry installation instructions with required warnings (OpenZep…

…pelin#4389)

scripts/upgradeable/upgradeable.patch

@@ -59,7 +59,7 @@ index ff596b0c..00000000
 -<!-- Make sure that you have reviewed the OpenZeppelin Contracts Contributor Guidelines. -->
 -<!-- https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/CONTRIBUTING.md -->
 diff --git a/README.md b/README.md
-index 27627f43..e42a66e8 100644
+index 9d1c405b..c264e29c 100644
 --- a/README.md
 +++ b/README.md
 @@ -19,6 +19,9 @@
@@ -106,7 +106,7 @@ index 27627f43..e42a66e8 100644
  }
  ```
 diff --git a/contracts/finance/VestingWallet.sol b/contracts/finance/VestingWallet.sol
-index f776a7ca..d7a7e0b0 100644
+index ebdf0a33..8888803e 100644
 --- a/contracts/finance/VestingWallet.sol
 +++ b/contracts/finance/VestingWallet.sol
 @@ -19,6 +19,8 @@ import {Context} from "../utils/Context.sol";
@@ -152,7 +152,7 @@ index df141192..1cf90ad1 100644
    "keywords": [
      "solidity",
 diff --git a/contracts/token/ERC20/extensions/ERC20Capped.sol b/contracts/token/ERC20/extensions/ERC20Capped.sol
-index 98ec7144..4992115b 100644
+index 41e9ce5c..1d910dfa 100644
 --- a/contracts/token/ERC20/extensions/ERC20Capped.sol
 +++ b/contracts/token/ERC20/extensions/ERC20Capped.sol
 @@ -7,6 +7,8 @@ import {ERC20} from "../ERC20.sol";
@@ -165,7 +165,7 @@ index 98ec7144..4992115b 100644
  abstract contract ERC20Capped is ERC20 {
      uint256 private immutable _cap;
 diff --git a/contracts/token/ERC20/extensions/ERC20Permit.sol b/contracts/token/ERC20/extensions/ERC20Permit.sol
-index 8778f4ba..825d4e16 100644
+index 4378eb7c..1da9e731 100644
 --- a/contracts/token/ERC20/extensions/ERC20Permit.sol
 +++ b/contracts/token/ERC20/extensions/ERC20Permit.sol
 @@ -18,6 +18,8 @@ import {Nonces} from "../../../utils/Nonces.sol";
@@ -178,7 +178,7 @@ index 8778f4ba..825d4e16 100644
  abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712, Nonces {
      // solhint-disable-next-line var-name-mixedcase
 diff --git a/contracts/token/ERC20/extensions/ERC20Wrapper.sol b/contracts/token/ERC20/extensions/ERC20Wrapper.sol
-index 2cbff622..97f43d7a 100644
+index 389965e9..66436b14 100644
 --- a/contracts/token/ERC20/extensions/ERC20Wrapper.sol
 +++ b/contracts/token/ERC20/extensions/ERC20Wrapper.sol
 @@ -14,6 +14,8 @@ import {SafeERC20} from "../utils/SafeERC20.sol";
@@ -361,7 +361,7 @@ index d94e956a..86bb5713 100644
      }
  }
 diff --git a/package.json b/package.json
-index 9eae6732..b3a56366 100644
+index 37e8f871..d098669f 100644
 --- a/package.json
 +++ b/package.json
 @@ -33,7 +33,7 @@